Purchasing documents for summarized jit calls determined again in item &

What causes this issue?

Item &V1& contains summarized JIT calls. The purchasing documents
belonging to these summarized JIT calls do not match the vendor which
was transferred for the inbound delivery.

System Response

As purchase order determination is switched on (which is permitted by
the control cycle), the system has determined new purchasing documents
for the summarized JIT calls.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.