Automatically add Action Plan

I am trying to automatically add an action plan to a application through a flow, when inserting an application I get the following error:

This error occurred when the flow tried to create records: UNKNOWN_EXCEPTION: com.sun.media.sound.InvalidDataException: Invalid field DocumentChecklistItem.DocumentType.

Has anyone seen this before, I have access to the DocumentChecklistItem obejct and the documentType field.

Thanks