Previous Price Not Updating

Hi,

While doing Cost Estimate at step Marking-- price it showing in future price, after releasing its getting updated as current price in Material Master upto this fine. But it should show previos price also in Material Master.. I have verified Price Change document its showing old price and new price also..

my question why its not getting update in previous planned price field in material master costing-2 view? I think its standard behavour..no additional confg required for this..

Appreciate your inputs!

Thnks

Srinu