CURRENCY GAIN / LOSS CORRECTION

Accountright is creating a realised G/L when changing from order to Invoice.

I pay a deposit then balance.

I input the Custom exchange rate and it looks fine - until I change from order to bill ..... and later it shows!

How can I correct this - as there isn't a gain or loss.

I've been waiting on the phone to MYOB for 1 1/2 hours - for the second time and getting nowhere!

I've spent ages reading notes which don't help either.

Looking forward to HELP from here please.