Have you ever tried saving a WI template and encountered a MP mapping error msg?
One day after lunch, the solution became clear.... Remove all prompt mapping for all activities in the RO. Then edit the template and it should let you save. Then remap the prompts.
Sadly prior to realising this we had duplicated about a dozen or more ROs which caused our reporting guru a headache when all submitted SRs using these replaced ROs became orphans in the DB.
Back to lunch.