SAP Message XC161 - Subcontracting component with requirements quantity of zero

Diagnosis
A subcontracting order exists in SAP APO that contains components with arequirements quantity of zero. In the ERP system, it is not possible tocreate subcontracting components with a requirements quantity of zero.
Subcontracting component: &V1&, plant: &V2&, production version: &V3&
(Internal APO order number: &V4&)

System Response
The ERP system ignores these subcontracting components.