Hello,
On our Sales Part, we add a secondary reference which is our client product number (the sales number is our internal reference)
When an user add a Sales Part to a customer agreement, he select a sales part then do is configuration and validate it.
Once it’s created, the secondary reference custom attribute which is a read only is filled.
What I want, for clarity for user, is when they choose a sales part, the custom attribute is refreshed to display the value.
You can see example on screenshots of what I except :

For now, the user can see this custom attribute only after validation and page refreshed (triggered by validation).
Is there a way to achieve this ?
Thank you