Pricing, Adding Statistical Value in the net value of the sales order

Hi,

I have a value in the condition type, that condition is a statistical condition.

i want to add the statistical value in the net value of the order.

if i mark the condition as non-statistical, the net value become as required, but then account determinaton error occur while posting the invoice(Accounting document)

Note: i dont want to post the vlaue to any G/L Account, thats why imade this condition type as statistical.

Pls comment

your usefull input or guidance will be helpfull + point rewarding.

Thanks