We have already posted a Support Tip reminding customers of the need to rebuild all ZMF assembler exits (i.e. custom CMNEXnnn modules) when upgrading across the 8.3 release in the following post:

 Support Tip: Remember to rebuild all assembler exits when upgrading to ChangeMan ZMF 8.3+  

It is also important to note any significant changes to the supplied sample exits or copybooks that they use when upgrading the product. For example, customers who use the X09@ADSC table within CMNEX009 to add approvers to packages must note that up to and including the 8.2 Patch 7 release each table entry consisted of 90 byte records:

...
X09@ADSC DS    0CL90               approver description table    
         DC    CL3'JCL'            library type                  
         DC    CL8'JCLCHECK'       security entity name          
         DC    CL44'JCL Checker'   description                   
         DC    AL2(0002)           hierarchical order number     
         DC    AL1(X09$MSND)       MVS send notification vehicle 
         DC    CL32'SER004,SER006'  user list                    
...

However, this table has been reformatted in the 8.3 release so that each record consists of 1632 bytes:

...
X09@ADSC DS    0CL1632             approver description table     
         DC    CL3'JCL'            library type                   
         DC    CL8'JCLCHECK'       security entity name           
         DC    CL44'JCL Checker'   description                    
         DC    AL2(0002)           hierarchical order number      
         DC    AL1(X09$MSND)       MVS send notification vehicle  
         DC    CL44'SER004,SER006'  user list                     
         DC    AL1(X09$EMAL)       mail notification vehicle      
         DC    CL44'JDOE@ACMECO.CO.UK' user list                  
         DC    AL1(X09$EMAL)       mail notification vehicle      
         DC    CL44'RSMITH@ACMECO.CO.UK' user list                
         DC    32CL45' '           fill to 35 vehicle, user lists
...

Failure to note and merge changes such as this into your existing, customised exit will result in unpredictable results at time of execution.