We are currently using SOLMAN 3.2 and planning to configure CHaRMs.
If we change to SOLMAN 7.O at the later stage will there be any constraint in using CHaRMs.
in general there is not problem with the Change Request Management configuration on 3.2 and the later upgrade to 4.0. Only the project cycles should be closed before you perform the upgrade. Later on you can just regenerate them. Since ChaRM in 4.0 offers more functionality I would also recommend to start right away with 4.0.