How to get data from a standar BO(Customer) in a custom BO (embedded component)

Hi SAP Community.

I have a Custom BO :    Invoices.bo

Inside this BO  i have an association to to Customer

Association ToCustomer to Customer;

I have my custom BO. embedded in the customer BO.

I need the basic data from Customer in my evento - after modify in my custom BO  "invoices"

This is what i'm trying but i'm getting no data.

Thanks a lot for your help