Delivering Customer Order Line Connected to a Negative Charge Line

We are using Apps 9.

Scenario

1. We have a customer order line connected to a negative charge line.
2. The customer order line has two staged billing lines. An invoice was created for one of the staged billing lines. That invoice includes the negative charge line.
3. The customer order line has been reserved and picked.

Issue

When trying to deliver the customer order line, we receive a message that Negative amounts are not allowed.

Does anyone have any suggestions as to how to deliver this line? We are unable to disconnect the negative charge line from the customer order line because the order line has been partially invoiced.

Or, does anyone have any suggested work arounds to resolve?

Thank you!