MM configurations for SAP AFS System

Hi,

I'm working in MM configuration for SAP AFS production system, After uploading AFS Materials successfully and also created Purchase order to make a stock for that material, but PO created successfully but not able to do Goods receipts for created PO.

Errors : Purchase order xxxxx has no items,

Once created sales order for the same material again we got the error while GR but error is different.

GR is not possible for this PO number.

But material type is ROH , and its external procurement only.

Please let me know when we will get this type of errors.

Thanks and regards

Nisar.