I have to write a validation rule on the standard object 'TASK' . If the picklist value of the 'Subject' field is 'Status Update' then the 'Description' field should not have any value. I am trying to write the rule but always I am getting the below error.

Error: Incorrect parameter type for function 'ISPICKVAL()'. Expected Picklist, received Text

Below is my Validation Rule.

AND(ISPICKVAL( Subject , "Status Update") ,  NOT( Description = NULL ) )

Please help me in knowing where I am going wrong.


  • I checked with status picklist and this formula is working with that but not working with subject – Mr.Frodo May 2 '16 at 10:53
  • Is subject a text or a picklist? I think that subject is normally a text – mkorman May 2 '16 at 10:56

Try this

AND(Subject="Status Update",NOT(Description=NULL))

It is working fine

Hope this helps...

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