invoice vertification error because annual budget exceeded

Hi,

I have a P.O GR already completed. There is no foreign exchange rate involved in the P.O. let's say the full amount of the P.O is $100. There is also commitment for this P.O.( i.e $100 reserved for this P.O)

However, when user want to post invoice for this P.O she encountered annual budget exceeded by message.

There is a tax of 7% in the invoice. therefore the total amount of the invoice is $107.

I used fmavcr01 to check available amount is say $3.

Is this the cause of the error because $3 is not enough for the $7 tax?

Where can i check in the SAP configuration or tables to understand why I have this annual budget exceeded error.

Thank you very much!