Problem OBN to the SalesOder Facsheet

Hye dear SCN team

I have implemented a bonus plan in which I have a first Pane with the list of Employee and a Preview Pane with the list of the Purchase Order/Employee.

The structure of the BO is:

• BO_name:
  • Employee Node
    • Node with the list of Sales Oder attached to the Employee

In the preview pane I have created an OBN to the SalesOder Facsheet.

The Link element is the SalesOrder.ID.content (= Purchase Order ID).

This is a preview of my screen

The problem that I have when I click on the OBN of the PurchaseOrderID: the system always open the same Purchase ID ( the last one of the Node here in this exemple the system always show the nu. 469).

Thanks for your help.