Hi Yannick,
Yes, it is possible. We will use qucik view form.
Please refer to https://carldesouza.com/dynamics-crm-quick-view-forms/
Step 1. New a qucik view form for Opportunity.
Step 2. In the qucik view form, insert a sub-grid of Connection. Save and publish.
If you select the Active Connections as the Default view, it will show all connections of the current Opportunity in the form.
If you would only show the connection with the Account, you need to new a connection with the filter of Account.
Click New, enter the view name, Edit Filter Criteria, set the Type(Form) OR Type(To) equals Account.
Save the view, go back to form editor, select the new view.
Save and publish the form.
Step 3. Edit the Order form, insert a qucik view form.
Select Opportunity and the new from.
This way, the quick view form will show the connections of the opportunity which is the Opportunity lookup field value.
