Budget AC Field not defaulting in the Purchase Order

Hi,

Just completed a PO set up for a new Inventory Organization and created a PO directly by opening the PO form. The Budget AC field is not defaulting in the PO Distribution screen. This is stopping sending the PO for approval with "Your Budgetary Control action completed with exceptions".

Need to know whether I have missed any steps in the set up.

Best Regards

Jaliya