FRX as a cursor
You cannot create an FRX file as a cursor using the CREATE CURSOR command, because FRX files containa UNIQUE field which isn't allowed as a field name:
CREATE CURSOR errorCursor (UNIQUE L)
Update: wOOdy kindly pointed out that the above statement is wrong and provides the solution:
CREATE CURSOR NoErrorCursor ("UNIQUE" L)
You have to place the field name in quotation marks.