status.i4.v = bpm_set_reference_file_c(file_number.i4.v,

	This routine changes the reference file status for a BPM file for
	the selected machine.  See bpm_machine_c.

	file_number	number of file to change reference file status for
			(starts at 1)
	protection	reference file status
			(BPM_NOT_REFERENCE -> mark as nonreference file,
			 BPM_IS_REFERENCE -> mark as reference file)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid file number or reference status
				value passed
	CBS_NO_SUCH		file does not exist
	SQL_xxx			database error

	This function requires the following include files:

	ul_cbsaux/bpmuti.h, acnet_errors_h

	Related functions:

	bpm_machine_c, bpm_protect_file_c, bpm_set_save_file, bpm_save_data,
	bpm_rename_file_c, bpm_link_file_c, bpm_unlink_file_c,
	bpm_file_link_info_c, bpm_next_unlinked_file_c,
	bpm_find_oldest_file_number_c, bpm_file_menu_c, bpm_directory_info

	C/C++ usage:

	int	status;
	int	file_number = 1;
	int	reference = BPM_NOT_REFERENCE;

	status = bpm_set_reference_file_c(file_number,reference);