Multiple sales orders referenced to single qoutation

Good day

If you can assist, I am trying find a way to prevent a multiple sales orders to be referenced to a single qoutation. I have tried the following:

T-Code VOV7, AGN Completion rule is set to "B". T-Code VTAA QT (source) and OR (Target) "complete reference" is ticked. After making these changes, the system still allowed for more sales orders to be referenced and i had to create ne qoutations but it did not help.

Kindly assist or advise if i am missing a step

Thank you