Try to browse or edit IMS database cause following error shows on ISPF File Master Plus for IMS panel.
*** RETURN CODE OF 12 FROM DISPLAY OF 'CAWKPBRW' PANEL
*** DISPLAY PANEL(CAWKPBRW) MSG(CAWL605E) CURSOR(EDPSBNAM)
*** Message CAWL605E
*** CAWL605E message not found in 'ISPMLIB' library.
Release : 12.0
Component : FILE MASTER FOR IMS
LPAR is not defined the one of the alias for the File Master Plus for IMS dataset CDBIMSG0 caused the error.
After defined the library and refresh the File Master Plus for IMS, browse and edit panel worked.