Question no 2733 : Blocking Key in QM for Procurement

In SAP QM ECC6.0 EhP6, a 'Blockey Key' or Block Function can be assigned to the Quality Info Record to control the Procurement process, exactly which process does it block ?

(more than one answers)

A)  RFQ.
B)  Source Determination.
C)  Purchase Order.
D)  Goods Receipt.
E)  Invoice Verification.
.