Need to Update the Purchase Order Number for Invoices created using FBDI

Hi,

We have created 500+ AR Transactions using FBDI, During the creation we have given null in the Purchase Order Number columns. We need to update the PO numbers in Invoice level, but the invoices are already loaded. I assume this cannot done using FBDI. But s there any way to update this on Mass using any SQL or other way rather than taking up Manual approach as this will take some time.

Regards

George Simon