DBDUT0818E Segment `segname`, sequence field `fldname` must be first field after SEGM for IMS/ESA compatibility. Use system config, IBM DLI PLATFORM setting for DOS/VS syntax

An error message. For ESA compatibility, the sequence field must be the first field after the SEGM macro.

DBDUT0818E Segment segname, sequence field fldname must be first field after SEGM for IMS/ESA compatibility. Use system config, IBM DLI PLATFORM setting for DOS/VS syntax