3375790 - Error ME 124 raised while creating a regular PO (not STO) - SAP ERP & S/4HANA

You create a PO in ME21N using a Vendor/Supplier which has a plant assigned (you might not be aware that there is a plant assignment).

Error ME 124 "Material not subj. to inventory mgmt. in plant" is raised and the reason seems unknown as this should get triggered during STO (Stock Transport Order) creation only.

•Materials Management (MM)
•SAP ERP Central Component
•SAP ERP
•SAP enhancement package for SAP ERP
•SAP enhancement package for SAP ERP, version for SAP HANA
•SAP S/4HANA

Purchase Order, STO, ME21N, MM02, ME124 , ME124, Umlagerung , Nichtlagematerial, Stock Transfer Order, ME 124, EKKO-RESWK, RESWK, EKKO, Vendor, Supplier, Plant , ME22N , ME_CHECK_RESWK_STOCK_TRANSFER , MEPO_MATERIAL_CHECK , KBA , MM-PUR-PO , Purchase Orders , Problem