Funding Source Line Structure

With OMB removing the Line Structure from the AITPS, is there a reason that the Funding Source Line Structure is still included in the ITBudget schema? FundingSourceInvestmentLineStructure is still a required field. As it shares the same purpose and historical source as the investment line structure (requiring 00 for the investment lines and 04 for funding source lines) I would expect it to be removed as well. While it is simple enough to report, it seems to make sense to remove it as long as the investment line structure is being removed. (Alternatively, if it would be an issue at this point for vendors to remove the logic, it could be made optional.)