Writes all fields of the field group fg (see
FIELD-GROUPS) as one record to a
sequential dataset (paging). If a field group HEADER has been
defined, its fields prefix each record to form a sort key. You can sort
this dataset with SORT and process it
with LOOP ... ENDLOOP. After this,
EXTRACT cannot be execuuted again.
As soon as the first dataset for a field group has been
extracted with EXTRACT , the field group cannot be expanded using
INSERT . The field group
HEADER , in particular, cannot be expanded after the first
EXTRACT (regardless of field group).
EXTRACT_AFTER_SORT/LOOP : EXTRACT after SORT or
EXTRACT_FIELD_TOO_LARGE : Occupied length of a single field is
EXTRACT_HEADER_NOT_UNIQUE : Field group HEADER was
modified after records had been extracted with EXTRACT .
EXTRACT_TOO_LARGE : Total data length of a record to be
extracted (including HEADER fields) is too long.
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