I am doing a calculation of calculation and it always is 0. The object hierarchy is Change -> Task Change collection -> Time and Task collection. On Task Change I have an Actual Time attribute that calculates by looping through the Time and Task collection and sums the hours worked attribute. That calculates correctly and displays on each Task Change window. What I am then doing is summing up each calculated Actual Time attribute in the Task Change collection in hopes of rolling up the Actual Time to the Change window level. That is always returning 0. Any ideas or help is much appreciated.