Collection Plan - Default Org

We are trying to invoke the collection plan from a Shipping Responsibility (which can ship from about 25 Orgs).

But as the collection plan is specific to one Org....when invoking it, we do not want the user to have to choose the Org. So, Trying to default the Org, when defining the "function" in the parameter value.

Steps:

1. Create a new collection plan in Org YYY
2. Create a function in Application developer with the below parameter: QA_CUSTOM_CHILD_PLANS="29892" TXN_MODE="-1" ORG_CODE ='YYY'
3. Call the function in the menu for Responsibility "ABC"

What I want is that, when I go to Responsibility "ABC", and invoke the collection plan, I should not need to choose Org YYY. How do I achieve this?