Order of Rules

I read at the docs that rules are executed before the query that
generated them. Is there any way to change this?

Here's my problem: I have two tables, A and B, and after an INSERT on
table A, I want to update an specific field on table B, with the result
of a sum in A. To do this I needed some information about the row just
inserted, so I used rules. As my sum is running before the insertion,
its result is wrong.

Any ideas?

Tks

--
Nelio Alves Pereira Filho
IFX Networks - www.ifx.com.br
+55 11 3365-5863
nelio@ifx.com.br