Realized Gain/Loss accounts coding

Hi there,

I am a bit confused about the GL account coding of the realized gain/loss accounts. I know under Payables/Receivables options there are fields to define these accounts but are these only defaults? Currently our business posts to multiple locations, and we want to change the coding of the business unit for the gain/loss. However the Payables option defines a fixed location (not multiple) and we want only the business unit to change.

Can someone explain how the coding works for this? Since the location code was always fixed I don't think the gl accounts are being taken from the Payables option, are they also defined somewhere else? How can we change the business unit for all realised gain/loss accounts?