Logistical forms connection with Customer deliveries

Hi guys
When I’m creating a Logistical form in the Axelor, I’m selecting the Customer Delivery to import the list of goods. The question is that: is there any connecting between these documents after that? Because after the import of goods the field ‹ Stock move › becomes empty.
My goal is that: I want to send Logistical form report with Customer delivery report together by email when I press the button ‹ Collected ›, but I can’t understand: is there any connection between these documents in the back end