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* If current PLU1 has fixed price attribute, which is set in the program mode user cannot
change the unit price for PLU called up. However, if current PLU has non-fixed price
attribute user may change (override) the unit price as his/her sales transaction requires.
① In case of non-fixed priced PLU user may put in
(override) new price for current PLU at sales condition,
for example, "last minute sales" or "10 minutes
sales" etc. Lets try last minute sales of PLU 1; 1 kg for 1.99.