Unplanned delivery costs will lead to negative value

What causes this issue?

You entered an invoice with negative delivery costs. When simulating
or posting the invoice, the system divides these delivery costs among
the individual items. Since the delivery costs are negative, the
item amounts are reduced. In item &V1& this leads to a value that is 0
or even negative. This is not allowed.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Check the delivery costs and the amount in item
&V1&. If both are correct, you must manually divide the delivery
costs among the individual items with no amount being negative or
0.

Error message extract from SAP system. Copyright SAP SE.