PURPOSE: To accurately search and manage the change of unit price at the arrival of goods of the stock merchandise.

CONSTITUTION: The sales change slip which changes the unit price at the arrival of goods specified when they come in into the sales unit price of the same product to be stored in a merchandise master file is automatically prepared and outputted. Every time when the sales unit price to be storey in the merchandise master file is changed, the corresponding sales change slip is automatically prepared and outputted. Thus, all the unit prices of the merchandise to be stocked and managed are integrated and managed by the sales unit price to be stored in the merchandise master file and the change of the unit price at the arrival of goods can be searched from the sales change slip to be automatically outputted at the arrival of goods and at the time of changing the unit price.