Revenue value not flowing from SO to Project

Dear All,

I have created a customer project and corresponding Sales order with account assignment as WBS element.

So i am expecting that in output of report S_ALR_87013531 i should get both cost and revenue figures, but in output if the report revenue is not flowing from Sales order?

Please note that FROM SALES ORDER indicator is ticked and Rev Ele From Billing is maintained in Planning profile being used.

I have not created billing plan for WBS; because i am driving Billing from sales order.

What else could be the possible reason for revenue not flowing in WBS?

Regards,

Jatinder