Transfer assigned entries from one entity to another

[boris]

I am just starting with formula script and have one problem:
I have a 1:n relation between contacts and products (each person can have several products). Once a year I create an invoice for the products, For this I have ab entity invoice which also has a 1: n relation to contacts (one contact can hace several invoices).
How is it possible to copy the products assigned to a contact to each new invoice I create?

Many thanks
Boris

[victor]

Try the Sales Pack extension functionality. You can test it for free in the following ways: https://www.espocrm.com/demo/.

[boris]

I found out myself, that it could also be done by a workflow for the entity invoices like: produkteIds = targetEntity\attribute('produkteIds')