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Date/Time Stamp for picklist value change

Hi All,


Anytime a Picklist value changes I would like to update a timestamp field.  What logic can be used to determine that the field changes value ISChanged(Text(My Pick List field)) does not work.


Have a clunky way of doing this but hoping to get a more precise way.






Create a workflow,
Evaluate Rule: Ever time a record is created or Edited
Rule Criteria: Run this rule if the following formula evaluates to true


/* if the field has changed... */
ISCHANGED(PickListField__c )

Add Workflow Action:
Field Update: Time_Stamp_Field__c
Formula Value: Now()


Hope this helps.




I am frustrated with this same issue. When I create the field update Now() I have no issues. But when I set the formula to evaluate true for IsChanged(picklist_field), I get the following error:

Error: Function ISCHANGED may not be used in this type of formula


I also tried what the user suggested, Ischanged(Text(Picklist_field)) and I get the same error. Help!