Under each users rights in PM, in the Product Privileges tab, there are a few options to select from.
I wonder if one of those gives the user the access they need, if its not available to assign via the users Role they are tied to?
Does using Power User or Administrator give them the access you're seeking?
If one of those options does give the user the access you're seeking for them, of course you'll also want to keep an eye on what else it gives them access to. Ensure to much access isn't given when its not wanted.