On my AS400 nodes, the universe.log is filed with messages like these:
|ERROR|X|IO |pid=P.T| xn_get_id | O_TYPE_MU ID not found for <'MU_NAME'>
|INFO |X|IO |pid=P.T| o_io_cache_data_provider | ID for <'MU_NAME'> Not Found_
|ERROR|X|IO |pid=P.T| owls_mu_read | cannot find internal ID for MU ยช'MU_NAME'|
|ERROR|X|END|pid=P2.T2| cobol_handle_inheritance | Could not get info of MU 'MU_NAME' for successor of launch XXX.
Release : 6.x
Component : Dollar Universe Application Server
OS: AS400
DE123356
Update to a fix version listed below or a newer version if available.