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Validation calculation to Restrict changing picklist value

Question asked by al-kalbani on Apr 20, 2018
Latest reply on Apr 21, 2018 by SteveMartino

I have one field "CheckInStatus" and It have two values ( IN ) & ( OUT), I want to use Validation calculation to Restrict changing picklist value unless prior value is Reversing the current value.

I need to restrict people from being able to change two picklist values EXCEPT they CAN change one of the fields if it's Reversing the current value..

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