Intersting and subtle point.
One thing that has RUP diverging from other methods is when you create the Iteration Plan. Personally, I think this causes problems.
Other iterative development methods from Scrum to Barry Boehm’s Spiral Model start each iteration with a planning session for how the team will carry out the objectives defined in the higher-level plan. RUP ends each iteration with a plan for the next one. Considering that this is a one or two day variance, does it matter? I think it does.
And a pragmatic answer. Perhaps I'll do this work myself!!
So RUP is wrong! Whaddya gonna do about it? I’ll tell you what: fix it!
The Rational Unified Process is a set of process content that conforms to the framework of the Unified Process. With v7 of the process it is initially provided in two configurations – RUP for Large Projects and a stripped down RUP for Small Projects – and it is installed along with Rational Method Composer, a tool to modify the process. Does this sound like a process that someone is telling you that you are not allowed to modify?