Hi
Please check the following on this issue :
1.Goto KL02 -Enter actvity type LAB1 and Mark the the average price check box inside the Allocation default values tab.
2.Check the activity type settings for price.
- If it is '3' the price should be set manually through KP26.
- If it is '1' the price should be calculated automatically through KPSI Plan price calculation.
3.Check your customizing settings in: Controlling>General Controlling>>Organization>Maintain Versions> Select the Price Calculation tab of your fiscal year settings.
4.In OKTZ -check the transfer structure settings.
Check and revert