Retrieve partner for each item in VBPA

Hi everyone.

I have an issue due to the way SAP stores the data in VBPA.

I explain : for each different partner (at item level), they only store one item in VBPA. It compress the data like they say in OSS note 380507.

My problem is how can i retrieve all the items for a document ?

Is there any FM for that ?

exemple : in my diocument i have the following :

posnr -kunnr

1------ 123

2------ 123

In VBPA, i will only find the first line. I need a solution to retrieve the second one.

Thanks for your help.