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   Once a lookup on the field has been set, it is possible at any time to
   modify the parameters of the relation, in the following way:

     . Enter into the Dictionary environment by pressing the
       relative button.

     . Use the arrow keys to highlight the file containing the
       field whose relation parameters need to be modified. Press the
       Fields button.

     . Position the cursor on the desired field and press the
       Edit Lookup button.

     . Modify the necessary parameters and press the F10 key to
       save.