Customer uses the Revenue Line Items, but doesn't want to be forced to create one in order to save the Opportunity, as this does not fit their process. They want to create and save the Opp, then come back later and either enter or import the individual RLI records.
The admin section for Opportunities does not offer the RLI to be optionally added later. The only choices are use the RLI or don't use RLI and then they go away entirely.
Is there a way anyone has found to bypass the requirement that you must create at least one RLI?