The ACF2/CICS interface ACFPARM CICSKEY RESOURCE=TRANS OPTION parameter setting overrides the the DFHSIT XTRAN and XPCT parameters.
If the OPTION for TRANS is set to VALIDATE the SIT values XPCT and XTRANS are set to YES and following messages are issued during initialization:
ACFAE303 ACF2/CICS setting DFHSIT value XPCT=YES
ACFAE304 ACF2/CICS setting DFHSIT value XTRAN=YES
If the OPTION for TRANS is set to IGNORE the SIT values XPCT and XTRANS are set to NO and no messages are issued.
So if a site is not seeing the ACFAE303 and ACFAE304 messages that would indicate that the ACF2/CICS CICSKEY for Resource TRANS is set to IGNORE.
Details can be found in the CA ACF2 for z/OS CICS Support Guide in Chapter 5: CICS Interface Parameters.