Here is the code for the Button - 
{!REQUIRESCRIPT("/soap/ajax/26.0/connection.js")} 
{!REQUIRESCRIPT("/soap/ajax/30.0/apex.js")} 
var updateRecord = new Array(); 
var sfdcSessionId = "{!GETSESSIONID()}"; 
var query="Select Id,Submission_Indicator__c From Sales_Order_Line__c where Sales_Order__c='"+"{!Sales_Order__c.Id}"+"'"; 

var queryResult = sforce.connection.query(query); 
var records = queryResult.getArray('records'); 

var Type="{!Sales_Order__c.Type__c}"; 
var oppId="{!Sales_Order__c.OpportunityId__c}"; 

if(Type=="Prebuild") 
{ 
<!--sforce.apex.execute("EmailSubmitToOAbutton","SendEmailAlert", {SOid:'{!Sales_Order__c.Id}'});--> 

var squery=sforce.connection.query("Select ID from Prebuild__c where Opportunity__c='"+oppId+"'") 
var prebuildRecord=squery.getArray('records'); 
var prebuildRecordOne=prebuildRecord[0]; 
if(prebuildRecord.length>0) 
{ 
if(records.length!=0) 
{ 
for(i=0;i<records.length;i++) 
{ 
var update_sales_line = records[i]; 
update_sales_line.Submission_Indicator__c= true; 
updateRecord.push(update_sales_line); 
} 
} 
result = sforce.connection.update(updateRecord); 
//parent.location.href = parent.location.href; 

var SO = new sforce.SObject("Sales_Order__c"); 

SO.Id="{!Sales_Order__c.Id }"; 

SO.Status__c="{!Sales_Order__c.Status__c}"; 


if ( SO.Status__c == "Submitted to OA" || SO.Status__c=="Approved by OA") 
{ 
alert("Resubmission is not allowed for SalesOrder with Status as Approved by OA or Submitted to OA"); 

} 
else 
{ 
SO.Status__c="Submitted to OA"; 




function padzero(n) { 
return n < 10 ? '0' + n : n; 
} 

function pad2zeros(n) { 
if (n < 100) { 
n = '0' + n; 
} 
if (n < 10) { 
n = '0' + n; 
} 
return n; 
} 

function toISOString(d) { 
return d.getUTCFullYear() + '-' + padzero(d.getUTCMonth() + 1) + '-' + padzero(d.getUTCDate()) + 'T' + padzero(d.getUTCHours()) + ':' + padzero(d.getUTCMinutes()) + ':' + padzero(d.getUTCSeconds()) + '.' + pad2zeros(d.getUTCMilliseconds()) + 'Z'; 
} 

var now = new Date(); 
SO.Last_Submission_DateTime__c = toISOString(now); 

if(SO!=null) 
{ 
try 
{ 
updateSO = sforce.connection.update([SO]); 
window.location.reload(); 

} 
catch(e) 
{ 
alert("error : " + e); 
} 
} 
} 

}else 
{ 
alert("Prebuild Order Type is allowed only for opportunities with Prebuild request"); 
} 
} 
else 
{ 

if(records.length!=0) 
{ 
for(i=0;i<records.length;i++) 
{ 
var update_sales_line = records[i]; 
update_sales_line.Submission_Indicator__c= true; 
updateRecord.push(update_sales_line); 
} 
} 
result = sforce.connection.update(updateRecord); 
//parent.location.href = parent.location.href; 

var SO = new sforce.SObject("Sales_Order__c"); 

SO.Id="{!Sales_Order__c.Id }"; 

SO.Status__c="{!Sales_Order__c.Status__c}"; 


if ( SO.Status__c == "Submitted to OA" || SO.Status__c=="Approved by OA") 
{ 
alert("Resubmission is not allowed for SalesOrder with Status as Approved by OA or Submitted to OA"); 

} 
else 
{ 
SO.Status__c="Submitted to OA"; 




function padzero(n) { 
return n < 10 ? '0' + n : n; 
} 

function pad2zeros(n) { 
if (n < 100) { 
n = '0' + n; 
} 
if (n < 10) { 
n = '0' + n; 
} 
return n; 
} 

function toISOString(d) { 
return d.getUTCFullYear() + '-' + padzero(d.getUTCMonth() + 1) + '-' + padzero(d.getUTCDate()) + 'T' + padzero(d.getUTCHours()) + ':' + padzero(d.getUTCMinutes()) + ':' + padzero(d.getUTCSeconds()) + '.' + pad2zeros(d.getUTCMilliseconds()) + 'Z'; 
} 

var now = new Date(); 
SO.Last_Submission_DateTime__c = toISOString(now); 

if(SO!=null) 
{ 
try 
{ 
updateSO = sforce.connection.update([SO]); 
window.location.reload(); 

} 
catch(e) 
{ 
alert("error : " + e); 
} 
} 
} 
}