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SN SFSN SF 

Restrict user from Selecting certain values from Multiselect picklist

Hi , 

I have a Multiselect picklist with almost 50+ values (ex.: A,B,C,D etc)
I should allow user to select only A,B OR C .. If they choose values apart from A,B,C , then I should throw a Validation Error . 

Can you please suggest me how to accomplish this?

Regards,
SN
ShirishaShirisha (Salesforce Developers) 
Hi,

Greetings!

Please refer the suggested formula in the below thread:

https://trailblazers.salesforce.com/answers?id=9063A000000iex9QAA

Please mark it as best answer if it helps you to fix the issue.

Thank you!

Regards,
Shirisha Pathuri
VinayVinay (Salesforce Developers) 
Try below snippet 
AND(NOT(OR(INCLUDES(Multiselect__c,'A'),INCLUDES(Multiselect__c,'B'),INCLUDES(Multiselect__c,'C'))))

Thanks,
CharuDuttCharuDutt
Hi SN SF
Try The Following Validation Formula 
NOT(OR(INCLUDES( MultiPicklist, 'A'),INCLUDES( MultiPicklist, 'B'),INCLUDES( MultiPicklist, 'C')))
Please Mark It As Best If It Helps.
Thank You!
 
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There are many optins availbale online to add the static script. I have tried for irwell hills (https://www.irwellhills.com/). You can see on link.