Item number &2 does not exist for delivery &1

What causes this issue?

You have specified the item number &v2& for the
<DS:GLOS.delivery>delivery</>. This item, however, does not exist.

System Response

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

How to fix this error?

Check your entry and correct it if necessary.

Error message extract from SAP system. Copyright SAP SE.