Realised Gains & Losses Accounts In Accounts Payable

We recently set up a new instance of Oracle for a company we have acquired and set up the realized gains & losses GL accounts within Accounts Payable in two areas:

1) Accounts Payable - Setup - Options - Financial - Accounting tab - PO Rate Variance Gain & PO Rate Variance Loss fields

and

2) Accounts Payable - Setup - Options - Payables - Currency tab - Realised Gain, Realised Loss & Rounding fields

and this seems to be posting the correct amounts to the General Ledgera ccount codes we have set up.

Whilst doing this we realised that the GL account code we have been using in our own instance was wrong so we changed the GL code in the areas above to the correct code, but this doesn't seem to have taken affect within our own instance, it is still posting the entries from GL to the old wrong account code.