SAP Message WTADDI200 - Material & is not an additional

Diagnosis
Material &V1& is supposed to be an additionalfor which the system can determine relevant vendors.

System Response
INCLUDE ISR_VERARBEITUNG OBJECT DOKU ID TX

Procedure
INCLUDE ISR_VERWALTUNG OBJECT DOKU ID TX

Procedure for System Administration
Determine the number of the additionals document and analyze how thedocument came to be created. In theory, this error should never occur,as the system does not normally accept invalid materials when anadditional is created for a material.