We are working on inactivating a large number of assembly items and are working on the process to do this. In SB1 we are running into errors trying to uncheck the Master Default flag on the BOM that resides on the Manufacturing tab of the Assembly. When we try and do a CSV to False in this field it is giving us an error about a linked BOM and it cannot unset this check. Any suggestions? We can manually uncheck the box and then inactivate the related BOM and BOM REV but that is not practical for a large scale number of items we want to inactivate.

Have you tried by wf ? Or by mass update script ?

Script could mass update these