No delivery-relevant items in order &1, order type &2

What causes this issue?

The sales order you want to deliver, sales order &v1& with order type
&v2&, either contains no delivery-relevant items or its
delivery-relevant items have already been delivered.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.