MAPDUP, xxxx and yyyy both map to zzzz
GDE Information: This indicates that GDE encountered two REGIONs mapped to the same SEGMENT or two SEGMENTS mapped to the same FILE. xxxx and yyyy are the REGIONS or SEGMENTS with the same mapping. zzzz is the SEGMENT or FILE with more than one mapping. When you enter the VERIFY or EXIT command, GDE displays this message after it verifies the global directory.
Action: Delete mappings to eliminate duplication.