Defining Special Prices for Business Partners 
Use the procedures below to define the following types of special prices for business partners:
Date-dependent
Quantity-based
Procedure
Defining Date-Dependent Special Prices for a Business Partner
You can define date-dependent special prices for particular periods. If an item is sold within one of these periods, the date-dependent special price applies, ignoring the price in the price list.
Choose
Inventory 
Price Lists Special Prices Special Prices for Business Partners 
.The Special Prices for Business Partners window appears.
To define the special price of an item for a business partner, in the Special Prices for Business Partners window, enter the required business partner and item information.
To open the Period Discounts window, in the # column, double-click a row . Enter the required dates, price list, discount, and price and choose the Update button.
NoteIf no date-dependent special price has been defined for an item, SAP Business One assumes that the customer-specific special price has been valid since the date on which it was added. The special price with the appropriate valid-from date appears in the first row.
End of the note.To save the modified special prices, in the Special Prices for Business Partners window, choose the Update button.
Defining Quantity-Based Special Prices for a Business Partner
Choose
Inventory Price Lists Special Prices Special Prices for Business Partners .The Special Prices for Business Partners window appears.
To open the Period Discounts window, in the # column, double-click a row . Enter the required dates, price list, discount, and price.
In the Period Discounts window, double-click a price-list row to open the Special Prices - Volume Discounts window, and enter the quantity, discount, and special price.
After you enter or change the price, SAP Business One automatically calculates the discount according to the difference between quantity-based and the date-dependent special price.
To confirm your entries, choose the Update button in the Special Prices - Volume Discounts window and the Period Discounts window.
To save the modified special prices, choose Update in the Special Prices for Business Partners window.
NoteTo define quantity-based special prices, you do not have to define a date dependency in addition to the SAP Business One default one. You can also define quantity-based special prices directly, based on the special price for the business partner.
End of the note.