Setting a Pause rule based on the total order value of the order lines

Hi

I have created a pause rule for orders with a single order line, which pause when the FLine extendedAmount is less than a hard coded value. The plan is that the Pause will be release either by a scheduled job / REST service.

I am trying to get this to work when there are more than one line on the order, in this case the I want to pause when the total value of all of the lines is less that a fixed amount.

I have used a aggregate / sum function of the FLine.extendedAmount, but this never enters the pause THEN statement and the pause rule goes straight to completed.