Hi Vivek,
If you have activated "QM Material Auth" (QALS-QMATAUTH) group in Material master QM view, I think it will be activated globally for all inspection types added to the same material. You can't filter out any specific inspection type and the signature process will follow as per the set rule (Standard/Custom).
A small technical fix can be worked out in such a case at Insp lot creation user Exit. Below is a tentative logic -
If QALS-QMATAUTH ≠ "BLANK" (means, QM Material Auth grp is maintained in material master QM view), and Insp.lot origin (HERKUNFT) and Inspection Type (ART) = "03" ==> then when the inspection lot is created, please clear the values for "Dig.Sign.RR" (QALS-STAT24) and "Dig.sign UD" (QALS-STAT25).
Thanks,
Arijit