How can I import invoices from a subsystem into Oracle production in an incomplete status?

Summary:

I can populate an FBDI template using all the same transaction sources and transaction types that are used in the automated interfaces and then manually import the invoices in a complete status that still allows me to incomplete the invoice in the UI.

But if the transactions are imported via mulesoft and autointegration, they are in a complete status that does not allow me to incomplete them - the incomplete button is grayed out.

This is in our production environment and lower environments and will be production impacting.

We have a particular population of invoices from one of our subsystems that require lines from another subsystem be added to them and then invoice the customer out of Oracle instead of the subsystem.