After upgrading to Z/OS 2.03 RSU1812 we cannot compile and link a module using SUBSYS=LAM
To get around the abend we were able to copy the member out of the Librarian master file to a temp file and use that as input to the
job instead of using SUBSYS=LAM.
z/OS 2.3 RSU1812
After applying IBM maintenance RSU1812 for z/OS 2.3 APAR OA53955 (Z/OS 2.3) introduced new DEBCHK ADDLOCK/UNLOCK function which causes jobs using SUBSYS=LAM to fail with DEBCHK errors or SC03 abends on compiles.