| 摘要 |
PURPOSE:To trace back and execute corrections even in case of a subtotal discount by providing a subtotal discount call means and a means which cancels the amount of a called subtotal discount. CONSTITUTION:Control F/Fs in a receipt buffer 3 are searched for and data whose correction F/Fs are set are disregarded. When data for correction is read out, the data is read out only at the time of normal registration or a subtotal discount and displayed 4. When a correction is executed with a correction key, a correction F/F is set among the control F/Fs in the receipt buffer 3. Consequently, when the data is accessed again, the data is already corrected, so the access is impossible. The correction of subtotal discount data is executed in the same way and the data is read out unless its correction F/F is set, and the subtotal discount can be corrected by setting a correction F/F with the correction key. Thus, the subtotal discount which is registered previously is canceled, so a subtotal discount for the whole data is registered thereafter through normal operation. |
