Please enter an MPN material for your firm's own inv.-managed material &

What causes this issue?

The profile assigned to your firm's material requires the entry of an
<DS:GLOS.3526C020AFAB52B9E10000009B38F974>MPN material</> in the
purchase order.

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?

Use the input help facility to choose an MPN material that is assigned
to your firm's own inventory-managed (IM) material.

Error message extract from SAP system. Copyright SAP SE.