Correction of mixed-up namings: Only A.service was enabled/disabled. B.service was left untouched.
-- ** What exactly did you do (or not do) that was effective (or ineffective)? ** ** Used "systemctl enable A.service" as well as "systemctl daemon-reload" to activate "RequiredBy"-dependency. ** Instead A.service had to be disabled and re-enabled to properly create "Requires"-dependency. --- **Expected "B.service.requires/A.service" to be created directly if "systemctl enable A.service" is executed, even when A.service is already enabled. -- My apologies.
