To change the association of an Off-contract catalogue after the delivery note has become a payment note, follow these steps:
Reopen the delivery note (contact Adoria support to do this)
Break the link between the generic product with which the OC (Off-contract Catalogue) has been associated and the OC by clicking on the cross :
Return to the delivery note waiting to be processed
Click on "Finalize reception" to proceed with a new association