Problem Deleting a Part Description Map

How do we change the NAPA part category in the Map Part Description screen? I get the following error, even when I go the Map Applications and Delete All Application Maps. (I need to change the MPCC’s we’ve mapped this part type to as it was done incorrectly.)

Deleting all the application maps on the Map Application screen deletes the maps but not the actual NAPA applications. These applications stay in the database for net change exports.

Does the document have just a single Part Description map? If so, you can delete the publishing for the document. All applications will be deleted and you will need to send a full file to NAPA. This should allow you to change the Part Description Map.