LINE MAPPING: PROFT.EXT.DUP

Hello everyone,
1. I don't know file PROFT.EXT.DUP in line mapping.
2. When PROFT.EXT.DUP = REC occurred in lines
I'm using R14.
Thanks a lot in Advance.

Have you read the helptext ???

PROFT.EXT.DUP
Indicates whether Default details apply, Duplicate requests are allowed, or on which consolidate record(s) the sign defined in fields PROFIT TYPE and PROFIT SIGN applies.
If fields 39.1 to 52.1 inclusive are all 'Nil', and this report line is to be the default (catch all) line for Profit and Loss not printed else where, then DEF is to be entered here.
A CRF record will normally only appear once on any one report. Where it is requested that the details are to appear on two or more lines, the 'Y' is to be entered in this field to indicate that duplication is allowed. For a CRF record to appear twice in a report, the details specified in fields 39.1 to 52.1 must be duplicated in either 39.1 to 52.1 or in 73.1 to 86.1.

Validation Rules:
Up to 3 type A (alphanumeric) characters with the values: . Y = Duplication allowed . DEF = Default details . REC = Record on which the sign applies Multivalue field associated with fields 39.1 to 52.1. Optional input.
If 'Y' is entered and no duplication is found, the entry will be treated as an error.
When 'Record' has been defined in the field 10 'PROFIT TYPE' input of REC in at least one multivalue of this field will be mandatory.