Activity based price planning

Hi PP Gurus,

I have created cost center with my controlling area, activated controlling are, created secondary cost element withe cost element category 43, cerated activity. Then in KP26 assign activity type with cost center period wise & gave variable prize. In production order I get actual price perfectly but planned price getting something different. I don't know where I am wrong. Any change in configuration or what?

Jayesh Narvankar