We have a situation where, two parts were created with wrong Bae UOMs . The UOMs need to be corrected. However, the parts have their own BOMs and also have been assigned in another BOM. Please note that the BOMs were created with Change numbers and when I try to delete the BOMs (both parent BOM and also the BOMs where the parts are assigned as components) using new Change numbers, it still does not allow us to change the Base UOM referring to the BOMs still existing in the system. Is archiving the BOMs,the only option here?