Field help (BPAADDSCO) 

This field corresponds, in order of priority, to:

In case of modification of the subcontract address, a message suggests to modify the site and location of the components involved too. If the answer is ‘Yes’, the storage site and location for which the allocation of the components to be supplied to the supplier is to be performed are also modified.
A consistency check is performed to make sure the receiving site and order site belong to the same company.