The number of partial deliveries & has already been reached

What causes this issue?

The order item allows only a limited number of partial deliveries. This
number has already been reached.

System Response

The system cannot create another delivery for this order item.

How to fix this error?

You should change the partial delivery specification in the order
item (allowed number of partial deliveries or switch off the check).

Error message extract from SAP system. Copyright SAP SE.