Hello,
Please could someone help me on what I need to write in the Related Action configuration of the Delete button for it to work and delete the record from site as well as DB.
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I think the error message is pretty clear. Either the name of the variable in the process does not match, or it is not configured as a parameter.
I think related action "Delete Exam" parameter is showing /* pp PassProof */ but you have mapped PP_Exam2. Maybe that would be the error.