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How do I disable the use of certain functions like VOID, REFUND and CR and ?

How do I disable the use of certain functions like VOID, REFUND and CR and make these valid only using the X or Z key on the Uniwell LX5400 series?
Coenie Louw, December 2011
on my cash register I simply pryed the key up and removed the spring from under and replaced the key. Everything looked as usual but the key no longer functioned.

Denice, June 2012
link Click here to see other fixes for Uniwell.