Working in MAPSB creates equivalent links between upstream and downstream BOM.
To not break those links it is important that updates of downstream BOM only are done in MAPSB.
If updates of a downstream BOM is done in ordinary PSB, the equivalent links could be broken.
To secure that it would be great to have a preference that could "block" or at least "notice" all updates command in PSB if the BOM have equivalent links.
This will secure that users do not change downstream BOM by mistake with wrong Windchill functionality.
