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Do the # ***** and # ***** keys not work, both when using them to select a clerk #, and when (a different function and context) using them to select a department # ?
Try this, with department # ***** See if you can make # ***** taxable, or whether that too just beeps at you when you get to #8:
I don't know. I'm inclined to think that it was a matter of the register having a glitch and changing its configuration slightly. But it could be an accidental keystroke too, maybe... let me know how it goes. The sequence I proposed might 're-do' the settings for department 8, and make it workable again. If it seems to have done so, then do the same sequence, only for department "09".
Incidentally, if those departments (Either one) are supposed to be tax-free, then enter
(six zeros) for the Tax Rate, rather than 000001.