vprs condition type

Hi,

In pricing condition VPRS condition type is coming but value is not coming.

I am not so sure,but I took a look at condition amount determine analysis.It's said that : "Condition types (for example, VPRS), that have the condition category 'G', determine their condition amount either from the material valuation data or the amount is calculated from the condition value. The information here has been read from the material valuation data."

please suggest.

sap sd 2011