Validations for merge and purge of replaced part

Validations will be:

Note: Merge & Purge requests are created with a status of Merge Requested. There is a scheduled job that processes all those requests. This repeats the standard Merge & Purge validations. If something is invalid, the merge will not continue. All outstanding merge requests can be viewed on the Outstanding Batch Merge Requests display screen. At that point, if there is an error, you can choose the Batch Merge option which will perform the validations interactively, and you can see what prevented the merge from happening.