Question: Problem setting up a rule with Intat

Sometimes Maple can be endlessly frustrating!!

A recent question of mine on how to distribute integrals into a sum was answered:

http://www.mapleprimes.com/questions/201500-Integral-Of-A-Sum--Sum-Of-Integrals-In-Maple

Now I need the same thing, except (as part of a solution) Maple chose to use Intat rather than Int.

So I modify the rule I have to look like this:

ToSumInt:=Intat(A::algebraic*Sum(v::algebraic,r::{name,equation})*B::algebraic,u::{name,equation})=Sum(Intat(A*v*B,u),r);

.. and for the heck of it I cannot get Maple to accept this, no matter what type I make u to be. The error message always looks the same:

Error, invalid input: Intat expects its 2nd argument, dx_at_t, to be of type symbol = algebraic, but received u::{name, equation}

and you may replace the u::{name,equation} with any other u::type you care to think of.

Any help would be appreciated.

M.D.

Edit: Also, useInt will not replace the Intat (in the expression I want to apply the rule to) with Int.