How to get transaction id in account generator process EBS

Hi All,

I'm working with a previously custom account generator process, specifically purchase order (PO Account Generator). I have to include a validation for purchase orders distributions related to a project, I opened the workflow and i found the custom package but i cant find the attribute who store the po_header_id or the po_line_id. I get all the workflow attribute values whit getitemattrnumber and getitemattrtext and then store the attributes in a custom table but no one has the values to identify the transaction.

I tried to filter with the values i have for example the project_id, task_id and inventory_item_id but i get all the purchase orders related.