Yes, it is possible, that why I´m trying to put an error message.
In our process we dont want the automatic inforecord creation, we need the purchase department create manually all the inforecords for the materials. Thats why we considerate if you create a purchase order you can get a mistake and put a wrong inforecord and we are trying to avoid this future error.
First you create a PO with material A with ME21N, then you assigne manually the inforecord for material B.
Sap doesnt pick the values from that inforecords.