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Designing a Printing Press Invoice :

Printing presses generally charge at the rate per thousand prints. It is further multiplied by No. of colors used in printing.

Suppose if qty is 2300 with 2 colors printing and Rate is Rs. 100 per thousand then amount will equal to (2300/1000) * 2 * 100 = 460

The above calculation is often subject to a condition of minimum quantity which is generally 2000. If the quantity is less then minimum quantity then amount will charged on the basis of minimum quantity. In the above example, if quantity were 1300 , the amount will be 400 ( calculated for a minimum quantity of 2000). You may change the minimum quantity.

You have to add two following columns in DocColumns:
        1.  PRINT_MIN_QTY
        2.  PRINT_COLOR

PRINT_MIN_QTY is used for inputting minimum quantity and PRINT_COLOR is for inputting no. of colors.

The minimum quantity may be predefined in Stock master. No default field is available for inputting minimum quantity. To add the Minimum quantity field click on  'Others' -> 'Define Additional Input Items'   and mention "Min Qty,qPrintMinQty,N,5". This create qPrintMinQty field in stock master. Mention qPrintMinQty against ColFieldNameMaster property of PRINT_MIN_QTY column in DocColumns. You are advised to use qPrintMinQty field for database.
 
However if minimum quantity and print color are equal to 0 then above formula shall not apply and normal calculations i.e. Quantity * Rate shall be performed.

Sometimes some additional amount is charged for some special effects. For that purpose a column namely ADD_AMOUNT is provided. This amount will be increased / reduced from the calculation made as per formula described above.