post a bill to account payable, transaction balance is 0.00

[zhangweiwu at realss.com]

Derek Atkins schrieb:
> Check the currencies of everything, in particular the currency of
> your Vendor and the currency of the A/P account.  This issue 
> usually implies you have mismatched currencies.
>   
Experiments shows you are right. Where do I enter the exchange rate
information if the Vendor and A/P are really of different currency? I
did searched about currency in help and didn't find user-related topics
(only technical documents about internals of gnucash did I find).