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Removing E54 and E22 in tax register?

am working with Onda RCH cash register but its displaying E54 and also Err22 simultanoeusly. how do i correct it
Erick, November 2013
I'm not sure of E54, but E22 means the item has not been programmed.

Registerman, November 2013
link Click here to see other fixes for Onda RCH.