Checking of Default Settings during Shopping Cart creation

Dear Friends

I am using SRM 7.0.

I want to check the "Default Settings" when a Shopping Cart item(s) is created.

User can set default settings before creating SC, for example, Product Category and Product Group.

I need help with following.

When a SC item is created, I want to check the Product Category entered by the user in SC line item and if the entered Product Category is different from the default setting of Product Category then I donu2019t want the Product Group defaulted.

I can probably use BBP_DOC_CHANGE_BADI to do this check and blank out the Product Group.

But, how do I check or get the "Default Settings" during SC item creation, in this BADI?

Thank you very much in advance for any help or suggestion.

Acharya