How to display a divergent total ?

Hello BI experts,,

I'd like to display a  purchase order payed total but as an invoice can pay several purchase order items, if I used the standard aggregation, the total is not correct (8 936,00). The correct total is 5377,20.

How can I do to have a total which not totalize the amount of invoice 47/14-D twice ?

Thank you in advance for your help

Regards,

Nicolas