'Delivery completed' indicator of item is reset

What causes this issue?

The quantity delivered is within the underdelivery tolerance.

System Response

The system automatically resets the
<GL:"delivery_completed"_indicator>"delivery completed" indicator</> in
the purchase order or order item.

How to fix this error?

If you are not expecting another delivery, reset the "delivery
completed" indicator.

Error message extract from SAP system. Copyright SAP SE.