No they can't. Your IP has to prove that they are entitled to receive the money, and this is entirely dictated by the terms of your IVA proposal.
However, some IPs do take the view that even if the wording does not cover the specific asset, you should have declared it at the time you entered into the IVA. In these cases most claims are usually addressed via compromise.
Why does your IP feel that they are entitled to receive the money?
