Solution : https://service.sap.com/sap/support/notes/399419 (SAP Service marketplace login required)
Key words : 
ddic corrections sap releases 4, current ddic corrections, terms db2foros/390 os/390, shared db2 catalog, sap basis release 6, sap systems simultaneously, individual sap systems, r3setup mcod reason, general comments               refer, sap systems
Related Notes : 
       
| 493836 | DB2/390: 6.20 Installation on z/OS, UNIX and Windows | 
| 440954 | DB2/390: MCOD aspects in CCMS | 
| 407663 | DB2/390: DDIC corrections (6.10, 6.20) | 
| 393865 | DB2/390: 6.10 Installation on OS/390, UNIX and Windows | 
| 388866 | Multiple Components on One Database - Installation | 
| 304702 | DB2/390: 4.6D Installation on OS/390, UNIX and NT | 
| 184399 | DB2/390: DDIC corrections (Releases 4.6A,4.6B,4.6C,4.6D) | 
| 81737 | DB2-z/OS: APAR List |