ME51N Default value for Address Group in Delivery Address pick list

Need to know how to change the default value of "ME01" in the field "Address group" on the Restrict Value Range pick list for Delivery Address on transaction ME51N. I have tried adding the parameter ADG with the value of CA01, which is the address group we are using for delivery addresses in our system, without success.

Thanks,

Sherrye Owen

Tarrant County Government