Approval Rule for Expense Reports with Items Assigned to Different Cost Centres

Summary:

I am attempting to create an approval rule where, if an Expense Report contains items assigned to cost centres different from the employee's default cost centre, the approval should route to the respective Cost Centre Managers.

Here are the expressions I have tried:

1. Expense Report/costCenterTotalVO.Cost Center - isn't - Expense Report.Default Cost Center
2. Expense Report/costCenterTotalVO.Cost Center - isn't - Task.payload.empDefaultCostCenter

Both expressions validate successfully, but they do not work as expected during testing.

Additionally, since the above expressions did not work, I have been unable to test whether the following expression in the list builder functions correctly: