If the maps are for use in a COBOL program, and STORAGE=AUTO has not been specified in the DFHMSD macro, they must be specified in descending size sequence. (Size refers to the generated 01-level data areas and not to the size of the map on the screen.)
You should ensure that the names of maps, and names of fields within a mapset (or within multiple mapsets that are copied into one application program) are unique. However, a map can have the same name as a mapset.
Before CICS® can load a physical map, you must define a physical map using an RDO DEFINE MAPSET command.