RC/Compare fails with a S0C4 Abend in RML@BLDC while doing the ICL for a compare strategy using old customized Models.

Products

• RC Compare for DB2 for z/OS

Issue/Introduction

With current maintenance a RC/Compare for Db2 for z/OS (RCC) job fails with a S0C4 abend in module RML@BLDC :
                     
SYSTEM COMPLETION CODE=0C4  REASON CODE=00000004            
 PSW AT TIME OF ERROR  078D0000   9D516D50  ILC 2  INTC 04  
   ACTIVE MODULE           ADDRESS=00000000_1D3EB000  OFFSET
   NAME=RML@BLDC                                            
   DATA AT PSW  1D516D4A - F004181F  0E0E58E0  40CC58F0     

However, using the current @DEFAULT Model ID, that same job works fine.

Resolution

One of the known problems with user customized models is that the regular maintenance does not touch them, only the @DEFAULT custom subsystem
default is updated. So the older customized models can get out of date. This is because we have no way of parsing what changes the customer has made. 
It is a good Best Practice to create new customized models from the @DEFAULT upon each new release or at least do testing to make sure that they still
work after an upgrade to a new release.