I've added an item column field on transaction forms that is used as part of the calculation called 'duration'. When the field has a value, the following client-script is performed: amount=(quantity*duration)*rate

Now if you happen to add one or more line items while the 'Customer:Job' field is empty and then enter a Customer:Job, the sourcing of various fields occurs and interestingly, so does a recalc of all of the line items setting them to: amount=qty*rate, effectively wiping out my calculation.

I tried putting an event handler in the post-sourcing event to go back through the line items and recalc them to use my field, but it seems that my function runs *before* this recalc so is a moot point.