How to use "Business Configuration Set" in script

Hello every one,

I have craeted a Custom Code list and then BCS  that contains, Order Type and Partner Role and Desription.

Here when we want to craete a new salesOrder, we can define a DocumentType. and then chose the Account.

I want to say that if we chose Ho.re.ca. Order DocumentType, in the account we have to chose one of the accounts that has the "Customer" role.

But I do not know in my script how can I say if this.DocumentType = order type of BCS ,...

Can anyone help me with this?

Thanks