Field help (BPAADD4) 

The delivery address is initialized:

From this field, you can directly enter an address code whose existence is controlled or use the Actions icon to:

If the address code is modified during entry, the sales representatives on the invoice header associated with the shipment address are automatically reassigned by the sales representatives codes for the new address. If the value of the LINREP - Sales rep on detail parameter is Yes, a message suggests the replacement of the sales reps of the invoice lines with the new sales reps on the header. If the value of the LINREP - Sales rep on detail parameter is No, the reassignment is performed automatically.

Once the invoice has been created, the address code can no longer be modified, but it is possible to display the detailed address information by clicking the Address field from the Actions icon.
Comment: the address can be modified via the Address/Delivery menu. If the modification impacts the country and/or the geographic subdivision, provided the invoice has not been validated, a dialog box is displayed and asks whether to recalculate the prices and discounts. The answer Yes generates a price list search, based on the new country code and/or the new geographic subdivision code, for all the lines of the document.