Purchase Order receipts not accounting

Hello,

We have a an external system that is used to create Purchase Orders as well as integrates the receipts for these orders. We've noticed that anything that's been generated against this external system, even though in Fusion it is receipted (you can see the receipt against the PO), it's not creating the accounting for these orders.

It is only the external PO's that are impacted, as anything raised via a Purchase Requisition from within Fusion is being accounted once the receipt has been created.

Does any one have any ideas as to what we could be missing? When we run the create accounting process for the PO's these are the requests we run: