I am trying to have a business event trigger when a new shipment is created that is going to an address outside the US. When that happens, I’d like to update the value in a custom field we have for the shipment, or if that won’t work place the updated value in the Note Text field on the shipment.
I have created a GI that successfully finds the new shipments with that criterion, and a business event that is triggering properly when a new shipment is created outside of the US. The Action Execution is where I am failing and getting an error of ‘Object reference not set to an instance of an object.’
I must not be properly setting up the action execution components - probably in the action name, because I don’t see how to edit a field in the actions. Pasting in screen shots below:
GI I have created is GI989152, and I have selected the Action Screen to be the shipment transaction screen (I believe this is correct). I just don’t see a proper action name however. I had been using “Insert” (below it shows Inventory Summary but I know that would not be correct).

Here is the Field Value - want to replace the Note Text field with ‘zx’ + the value already in the [SOShipment.usrSSSOCustomerOrderNbr] field.

The third tab below

Any thoughts on why this is getting an error? Perhaps I am not using the proper Action Screen or Action Name?
Thanks!
Patrick