Template:M comp 2002 ISDA 10(c)

Again, a provision largely there to keep the respective tax departments happy. Each books the transaction depending on certain tax representations from the other; if the other then changes Offices or some such thing in a way that upsets that careful tax analysis, well —

Simple: just don’t fiddle with Offices and Branches post execution. Why would you? (Unless to correct an error you made on the Trade Date ... )