Deafult Depository in R10

Hi,

I am trying to understand the functionality of defaulting depository in R10.

The scenario is that we need to define one depository as a default which I beleiev we can do at the SECEURITY.MASTER level. But, the Customer or Portfolio should be able to bypass this default and default to another depository while doing trades. I understand there is a DEFAULT.DEPO field on the SEC.ACC.MASTER record but can someone please guide how this can be set-up to achieve the required result?

Thanks and regards

Default depository could be setup on below tables and is picked in the same sequence:
1. SAM
2. CUSTOMER.SECURITY
3. SC.CU.DEPO.DEFAULT
4. SECURITY.POSITION
5. SM