In a COBOL FD, FILLER data items are essentially place holders. FILLER items are not uniquely named and thus cannot be uniquely referenced. For this reason, they are not placed into the Acucorp data dictionary. The dictionary maintains the correct mapping of the other fields, and no COBOL record positional information is lost.
Sometimes you need to include a FILLER data item, such as when it occurs as part of a key. In such a case, you could include it under a USE GROUP directive or give it a name of its own with the NAME directive. See NAME Directive for more information.