Answer
Inventory Part Planning (Inventory > Inventory Part Planning) is the logical unit that holds Safety Stock — set up History Log logging against that LU/table to track changes to it, rather than the more general Inventory Part tab.
Inventory Part Planning (Inventory > Inventory Part Planning) is the logical unit that holds Safety Stock — set up History Log logging against that LU/table to track changes to it, rather than the more general Inventory Part tab.