Delivery Management of DG- Members of another Distribution group

[Jamal1984]

I have a small DG abc@mydomain.com and a big DG xyz@mydomain.com. I configured the Delivery management of xyz@mydomain.com only with abc@mydomain.com. But the members of abc still able to send email to the group xyz@mydomian.com

How can I restrict them ?

[#2]

Can you re-read your original post as I don't think I understand the scenario. Better yet, share the corresponding DG properties: 

Get-DistributionGroup DG | fl Accept*,Require*,Reject*