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If a value appears in this field it indicates that the details of the field were input via the LANSA Built-In Function called FILE_FIELD. Refer to the Technical Reference Guide for more details of this (and other) Built-In Functions that allow file definitions to be created and edited directly from RDML programs. The value shown in this field is identical to the "source" argument given to the START_FILE_EDIT Built-In Function when automatic editing of this file definition was performed.