Ramakant: 
I added the formula: 

Location_Region__r.Name = 'Maryland'

Got this error message: 

Error: <div class="message errorM3" id="spanError"><table class="messageTable" border="0" cellpadding="0" cellspacing="0"><tr><td><img src="/img/s.gif" alt="Error" class="msgIcon" title="Error"/></td><td class="messageCell"><div class="messageText"><div class="spanningError"><h4>You have reached the maximum number of 15 object references on Closing</h4>You must remove at least 1 relationship(s) in order to save this Workflow Rule.<div class="thisFormula">Related objects referenced in this Workflow Rule:<ul><li>Location_Region__r</li></ul> </div><div id="otherFieldsTwist"><div class="twistyHeader"><img src="/img/s.gif" alt="Show Section" class="showListButton" id="otherFieldsTwist_twisty" title="Show Section"/><span class="twistyText">Show References</span></div><table class="otherFields" border="0" cellpadding="0" cellspacing="0" id="otherFieldsTwist_showHide"><tr><TH scope="col">Name</TH><TH scope="col">Type</TH><TH scope="col">Related Object Reference</TH><TH scope="col">Last Modified Date</TH><TH scope="col">Last Modified By</TH></tr> <tr><td class="objectName" colspan="5">Closing</td></tr> <tr><td><a href="/01Q410000007iSn">1 - Seller Closing - Appraisal Not Ordered 10 days- VA</a></td><td>Workflow Rule</td><td>rethink3__Listing__r</td><td>7/7/2017 4:33 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000QrZLA">Acquisition_Close_Date_if_SHT_Acquisit</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/20/2017 2:07 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJH1">Address</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONZAC">Alarm</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/30/2017 1:47 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONZAW">Alarm_Instructions</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/30/2017 1:47 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KSm">Buyer_2_Cell_Phone</a></td><td>Formula Field</td><td>Buyer_2__r</td><td>4/17/2017 8:24 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KSr">Buyer_2_Email</a></td><td>Formula Field</td><td>Buyer_2__r</td><td>4/17/2017 8:25 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KSc">Buyer_2_Phone</a></td><td>Formula Field</td><td>Buyer_2__r</td><td>4/17/2017 8:24 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KSI">Buyer_3_Email</a></td><td>Formula Field</td><td>Buyer_3__r</td><td>4/17/2017 8:23 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KS8">Buyer_3_Phone</a></td><td>Formula Field</td><td>Buyer_3__r</td><td>4/17/2017 8:21 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6DcV">Buyer_Agent_Cell_Phone</a></td><td>Formula Field</td><td>Buyer_Selling_Agent__r</td><td>4/16/2017 5:13 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6DcQ">Buyer_Agent_Phone</a></td><td>Formula Field</td><td>Buyer_Selling_Agent__r</td><td>4/16/2017 5:12 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KRy">Buyer_Cell_Phone</a></td><td>Formula Field</td><td>rethink3__Buyer__r</td><td>4/17/2017 8:19 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KRt">Buyer_Email</a></td><td>Formula Field</td><td>rethink3__Buyer__r</td><td>4/17/2017 8:18 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KRo">Buyer_Phone</a></td><td>Formula Field</td><td>rethink3__Buyer__r</td><td>4/17/2017 8:18 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KTB">Buyer_Selling_Agent_Assistant_Cell_Phone</a></td><td>Formula Field</td><td>Buyer_Selling_Agent_Assistant_CC__r</td><td>4/17/2017 8:28 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KTG">Buyer_Selling_Agent_Assistant_Email</a></td><td>Formula Field</td><td>Buyer_Selling_Agent_Assistant_CC__r</td><td>4/17/2017 8:29 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KT6">Buyer_Selling_Agent_Assistant_Phone</a></td><td>Formula Field</td><td>Buyer_Selling_Agent_Assistant_CC__r</td><td>4/17/2017 8:27 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KSw">Buyer_Selling_Agent_Cell_Phone</a></td><td>Formula Field</td><td>Buyer_Selling_Agent__r</td><td>4/17/2017 8:26 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0XX">Buyer_Selling_Agent_Email</a></td><td>Formula Field</td><td>Buyer_Selling_Agent__r</td><td>4/9/2017 4:42 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0Xc">Buyer_Selling_Agent_Phone</a></td><td>Formula Field</td><td>Buyer_Selling_Agent__r</td><td>4/9/2017 4:43 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJH7">City</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000VHVO1">City_sign</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>5/21/2017 6:22 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONZ9Y">Combo</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>10/10/2017 11:16 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000QrZNz">Commission_on_Net_Clause</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>3/15/2017 11:30 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONXlY">County</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/30/2017 12:40 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/04Y410000003dAY">GR Notes</a></td><td>Workflow Field Update</td><td>rethink3__Listing__r</td><td>2/1/2017 10:26 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/04Y410000003dAE">GR YEs</a></td><td>Workflow Field Update</td><td>rethink3__Listing__r</td><td>2/1/2017 9:41 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000QrfwX">GR_Due_Dates</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/21/2017 10:06 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000Qrfwh">GR_Info_Confirmed</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/21/2017 10:07 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000PXgiR">GR_Yes</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/1/2017 9:33 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000Q3JHO">Ground_Rent_Redeemable</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/9/2017 12:53 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TJusy">Internal_Notes_on_Lockbox_and_Alarm</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>4/8/2017 3:22 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KTk">Lender_Co</a></td><td>Formula Field</td><td>Lender_Company_Contact__r</td><td>4/17/2017 8:36 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0Xr">Lender_Co_Email</a></td><td>Formula Field</td><td>Lender_Company_Contact__r</td><td>4/9/2017 4:57 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0Xw">Lender_Co_phone</a></td><td>Formula Field</td><td>Lender_Company_Contact__r</td><td>4/9/2017 4:58 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJHd">List_Price</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dcf">Listing_Agent_Assistant</a></td><td>Formula Field</td><td>Listing_Agent_Assistant_CC__r</td><td>4/16/2017 5:14 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dcp">Listing_Agent_Assistant_Cell_Phone</a></td><td>Formula Field</td><td>Listing_Agent_Assistant_CC__r</td><td>4/16/2017 5:16 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dck">Listing_Agent_Assistant_Phone</a></td><td>Formula Field</td><td>Listing_Agent_Assistant_CC__r</td><td>4/16/2017 5:15 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KRj">Listing_Agent_Cell_Phone</a></td><td>Formula Field</td><td>Listing_Agent__r</td><td>4/17/2017 8:16 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0XS">Listing_Agent_Email</a></td><td>Formula Field</td><td>Listing_Agent__r</td><td>4/9/2017 4:40 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0XN">Listing_Agent_Phone</a></td><td>Formula Field</td><td>Listing_Agent__r</td><td>4/9/2017 4:35 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000PYyk3">Listing_Type</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/3/2017 2:30 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000Q1U7U">Location</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>3/1/2018 11:27 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONZ9n">Lockbox_Instructions</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/30/2017 1:45 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJHh">Marketing_Description</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJHj">Monthly_Rent</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJHk">Monthly_Rent_per_sqm_sqft</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJHr">Parking_Spaces</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000PYwtV">Preferred_Seller_Contact_Method</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/3/2017 1:06 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TIldV">Property_Is_Vacant</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>4/5/2017 9:34 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dao">Property_Owner_Cell_Phone</a></td><td>Formula Field</td><td>Property_Owner__r</td><td>4/16/2017 4:34 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6DaP">Property_Owner_Email</a></td><td>Formula Field</td><td>Property_Owner__r</td><td>4/16/2017 4:32 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dae">Property_Owner_Phone</a></td><td>Formula Field</td><td>Property_Owner__r</td><td>4/16/2017 4:33 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJHu">Property_Type</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000VHOQU">Replacement_Items_List_Link</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>5/20/2017 6:51 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000Q3HT3">Replacement_Items_List_Received</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/9/2017 11:41 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000PYynM">SHT_Acquisition</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>2/3/2017 2:31 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONba9">Seller_2_CC</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/4/2018 1:56 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6DbX">Seller_2_Cell_Phone</a></td><td>Formula Field</td><td>Seller_2__r</td><td>4/16/2017 4:40 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dc6">Seller_2_Email</a></td><td>Formula Field</td><td>Seller_2__r</td><td>4/16/2017 5:09 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6DbS">Seller_2_Phone</a></td><td>Formula Field</td><td>Seller_2__r</td><td>4/16/2017 4:39 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONc0b">Seller_3_CC</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/30/2017 2:26 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dbm">Seller_3_Cell_Phone</a></td><td>Formula Field</td><td>Seller_3__r</td><td>4/16/2017 4:41 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6DcB">Seller_3_Email</a></td><td>Formula Field</td><td>Seller_3__r</td><td>4/16/2017 5:10 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6Dbh">Seller_3_Phone</a></td><td>Formula Field</td><td>Seller_3__r</td><td>4/16/2017 4:40 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000Venrn">Seller_Is_A_Licensed_Realtor</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>5/28/2017 4:02 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONc1j">Seller_Nickname</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/30/2017 2:27 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJI0">Size</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJI1">State</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000SGaGV">TC_Email</a></td><td>Formula Field</td><td>TC_contact__r</td><td>4/17/2017 8:12 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000ONxqB">Tenant_Information</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>1/31/2017 12:26 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KTL">Title_Company_Cell_Phone</a></td><td>Formula Field</td><td>Title_Contact__r</td><td>4/17/2017 8:34 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KTf">Title_Company_Contact_CC_Cell_Phone</a></td><td>Formula Field</td><td>Title_Company_Contact_CC__r</td><td>4/17/2017 8:33 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KTQ">Title_Company_Contact_CC_Email</a></td><td>Formula Field</td><td>Title_Company_Contact_CC__r</td><td>4/17/2017 8:32 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KTa">Title_Company_Contact_CC_Phone</a></td><td>Formula Field</td><td>Title_Company_Contact_CC__r</td><td>4/17/2017 8:32 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0Xh">Title_Company_Email</a></td><td>Formula Field</td><td>Title_Contact__r</td><td>4/17/2017 8:34 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000TK0Xm">Title_Company_Phone</a></td><td>Formula Field</td><td>Title_Contact__r</td><td>4/17/2017 8:34 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6i3g">Transaction_Coordinator_Phone</a></td><td>Formula Field</td><td>TC_contact__r</td><td>4/17/2017 7:55 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/04Y410000006ibM">Update Name</a></td><td>Workflow Field Update</td><td>rethink3__Listing__r</td><td>2/23/2017 11:46 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJI9">Year_Built</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJIA">Zip_Code</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N4100000U6KSD">buyer_3_Cell_Phone</a></td><td>Formula Field</td><td>Buyer_3__r</td><td>4/17/2017 8:22 AM</td><td><a href="/00541000000uGyk">karla</a></td></tr> <tr><td><a href="/00N41000006sJIB">sale_price_to_list_price</a></td><td>Formula Field</td><td>rethink3__Listing__r</td><td>9/16/2016 2:19 PM</td><td><a href="/00541000000uGyk">karla</a></td></tr> </table></div><script>new TwistyElement('otherFieldsTwist_twisty', 'otherFieldsTwist_showHide', 'Show References', 'Hide References', true);</script></div></div></td></tr> </table></div><script>if (window.sfdcPage) sfdcPage.registerMessage('spanError');</script>