When trying to modify a message within IDD receive error
*+ E DC601242 DDLDCMSG CANNOT BE READIED
The command MODIFY MESSAGE will cause IDD to try to ready the DDLDCMSG area in UPDATE mode. This error DC601242, indicates this area cannot be readied in UPDATE mode.
Release : 18.5
Component : CA ADS
This most likely means that the DDLDCMSG area is in RETRIEVAL in this CV.
Issue the following command: (this assumes your segment name is SYSMSG. If this is not the case, you will need to determine the segment name by looking at the DBNAME table)
DCMT D AREA SYSMSG.DDLDCMSG
This area would need to be in update mode in order to modify the message. Do any other CVs share this DDLDCMSG area? Could one have it in update mode. If no other CVs have this area in update mode, you could try to vary it to update within this CV. If the vary is successful, your modify within IDD should work.
The DCMT VARY AREA will remain for the rest of the CV cycle, unless another DCMT acts on that area. When the CV is cycled, the area will come up with the status defined in the DMCL. You can look at the statement, on startup/warmstart in the DMCL.