Pricing condition shows in sales order but not shows in Invoice

Dear All,

I face a problem which as follows need some advice for solve this issue.

I create a new pricing condition which name as ZFEE (Install/service Fee) and table name 510. creating and assign all process complete i make a sale order which snap short name as attach Order. but when it goes to make a invoice after complete the delivery process the ZFEE not effect in Invoice which snap short name as attach Invoice.

I need you help to solve the problem.

Thanks

Rafiqul Hossain