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Asawari Kumbhalkar 4Asawari Kumbhalkar 4 

If the close date is not specified and status is ‘Closed-Filled’ or ‘Closed - Not Approved’ or ‘Closed - Canceled’ then error should be thrown as “Close date is not specified”.

CharuDuttCharuDutt
Hii Asawari
Try Below Validation
AND(ISBLANK(Close_Date__c),OR(ISPICKVAL(Status,'Closed-Filled'),ISPICKVAL(Status,'Closed - Not Approved'),ISPICKVAL(Status,'Closed - Canceled')))
Please Mark It As Best Answer If It Helps
Thank You!
Maharajan CMaharajan C
Hi Asawari,

Small change in charu formula:

ClosedDate is standard field:
 
AND(ISBLANK(ClosedDate),OR(ISPICKVAL(Status,'Closed-Filled'),ISPICKVAL(Status,'Closed - Not Approved'),ISPICKVAL(Status,'Closed - Canceled')))

Thanks,
Maharajan.C