The External entry must not be E for program-described subfield; defaults to blank.
20
Cause . . . . . : Externally-described-subfield specifications (E in External entry in position 22) are allowed only in externally-described data structures. Furthermore, externally-described-subfield specifications must be specified at the beginning of the externally-described data structure.
Recovery . . . : Change the External entry to blank, or change the definition of the data structure to externally described. Compile again.
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