Hi,
Considering you created an extra release characteristic as Purchasing Document category (CEKKO-BSTYP) and you use A for RFQ.
Did you create separate release group for RFQ?
If yes, create new release strategy for RFQ and keep all release vital values related to RFQ along with purchasing document category A in it.
Now try creating new RFQ and see how release strategy triggering!
Regards,
Biju K