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Abhishek AS 3Abhishek AS 3 

Validation rule on Status Picklist field based on Prior Value

I have a requirement on Status field. If previous value of status field  is "Story Definition" the value we can update must be only "Ready for DEv" or "Dev in Progress" if any other value is selected it must throw an error.
SwethaSwetha (Salesforce Developers) 
hi Abhishek,

Try below validation rule
TEXT(PRIORVALUE(Status)) = 'Story Definition',
NOT(ISPICKVAL(Status, 'Ready for DEv')),
NOT(ISPICKVAL(Status, 'Dev in Progress'))

If this information helps, please mark the answer as best. Thank you