DFS4442I THE DFS3PU00 UTILITY WILL LIST THE DBD AND PSB INSTANCES THAT ALREADY EXIST IN THE IMS CATALOG.
Explanation
The IMS Catalog Populate utility found the option DUPLIST in the control statement data set (ddname SYSINP).
System action
For each instance of a DBD or PSB that was not added to the IMS catalog because it was a duplicate of an existing instance, the utility issues message DFS4436I, which identifies the duplicate DBD or PSB segment that was not inserted.System programmer response
No action is required.