3796505 - Error: "Select a commodity code from the list" when I submit a requisition with a non-catalog item

When you submit a requisition containing a non-catalog item, the following error appears even though you select the appropriate commodity code and material group: 

Select a commodity code from the list. (service 'RequisitionUISrv', event 'DRAFT_PATCH', entity 'RequisitionUISrv.ReqLineItems')

SAP Ariba Buying

product classification, classification code mapping, commodity code, material group, productgroup, from version, mdapp admin center, non-catalog item, requisition submission , KBA , S2P-P2O-BX-SC , Shopping Cart , Problem