SAP Message WVMI217 - MRP type &1 (material &2, plant &3) does not allow vendor order entry

Diagnosis A purchase order is to be generated for a material in inboundprocessing of IDoc ORDRSP. The relevant MRP type does not, however,allow purchase orders to be entered by the vendor. System Response IDoc inbound processing terminated. Procedure Configure the MRP type for the relevantcombination of material and plant properly. The MRP type must have thefollowing characteristics: Characteristic,, Value ,, Meaning MRP procedure,, "W",, Replenishment Planning method,, "1",, planned by externalsystem