Display and undo document relationship

It would be quite good to be able to display the documents that have a relationship via a list, in order to remove the document or separate the relationship if necessary.
The following scenario best describes the situation:
Two completed orders where 1 document is stored each.
Collective invoice of the two documents = 1 unposted invoice. Invoice (document relationship was written in the background).
The employee deletes the order line that is not needed and posts the invoice to the posted invoice. Both documents are represented by the closed document relationship in the posted invoice, although only one document should still be there.
Open the list of the document relationship to the posted invoice and remove the document or the relationship to the removed order.
Result: Only the correct document for the order is displayed.