No posting rues exist for account key

Hi ALl,

I looked at the forum and this error has many discussions but none of them solve my problem .

My issue is in F-32 and as below

We have company code in GBP and Sales org in USD.

We post billing docuemnt to some customer in CAd .

When we clear then in F-32 we get the above error . We are clearing as below

RV Customer A 56..00( Debit )

DA Customer A55.99  ( credit )

When we click on save we get this error .

But when we enter that 0.1P in DIffenece in Posting field in F-32 that works,

I could not find any reason for that .

any thoughts .