Generate Invoice Preview issue

We created a Service quotation, from service quotation we created work order and after execution of work, in the work task tab we are marking lines in sales tab as not invoiceable and adding a new fixed price line for generating invoice preview. after adding the sales part and the sales price, the revenue% is still zero (0) and when we generate invoice preview we can see the sales price but the customer order is getting generated with zero value. Can you please help how to update the revenue % to 100% so that invoice can be generated from work order on the fixed line