Flagging the item as "delivery completed"

What causes this issue?

The quantity delivered is within the
<DS:GLOS.underdelivery_tolerance>underdelivery tolerance</> or
<DS:GLOS.overdelivery_tolerance>overdelivery tolerance</>.

System Response

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

How to fix this error?

Check the quantity delivered.
Cancel the "delivery completed" indicator if you expect further
deliveries for this purchase order or order item.

Error message extract from SAP system. Copyright SAP SE.