SAP does not calculate amount...

Dear Gurus,

Lets say ZPR0 is price conditition.

Its callculation class :Prices AND calculation type Quantity.

In sales order quantity:120

Amount 1 USD.

SAP calculates total condition value as 1*120=120...

But when I enter condition value as 120 for ZPR0; SAP does not calculate amount automatically.

SAP does not divide 120/120=1

How I customize it?

Kind Regards,