Quota arrangement specifies internal procurement

What causes this issue?

A <GL:quota_arrangement>quota arrangement</> exists for the material
you wish to order. The quota arrangement specifies that the material is
to be procured from a plant within your company.

System Response

INCLUDE NA_T160M LANGUAGE EN

How to fix this error?

Find out whether you can procure this material from an internal source.

Error message extract from SAP system. Copyright SAP SE.