I know this is true: To create or maintain an SSIS package, you must use the version of BIDS for that package. Eg. If an SSIS Pkg was developed in SQL 2005 BIDS, you must use SQL 2005 BIDS to maintain it. Optionally, you may convert/upgrade the SSIS Pkg to the version of SSDT or BIDS you have open.
Is the same true for SSRS RDL? If I have a report developed in SSRS BIDS 2005, (outside of converting it to SQL 2012) do I need to use BIDS 2005 to maintain it?