Item list contains no items for settlement

What causes this issue?

Based on your allocation, the system either could not determine any
items, or you have only selected items with a quantity of zero.

How to fix this error?

Check your allocation.
You might have only selected items with a quantity of zero. These items
are ignored. If you have selected these items, to distribute unplanned
delivery costs among them, select these items as a subsequent
debit/credit and enter a quantity for them.

Error message extract from SAP system. Copyright SAP SE.