Suggested by Lei Chang – New
Since retainer invoices do not get linked with a contract line, the current logic from the system will try to get the revenue profile rule for Fixed Price Project from billing method for a Time and Material due to some fallback defaulting. Issue 987096.
If the system is going to default the billing method to be T&M no matter what the project contract setup is, it should not allow a retainer/advance invoice to be created on fixed fee billing method.