BAQ - Join Problem

Hi.  We are putting into place a procedure to monitor our tooling work - this will include linking to Sales Orders received from the Customers and Purchase Orders placed with Suppliers.  We are using UD01 as the ‘Header’ table for the information.  I am creating a dashboard for this to be monitored and have a summary tab that groups everything together with total ordered, invoiced, etc.

My problem is that I also want a detail tab but as we could have multiple Sales Order Lines and / or Purchase Order lines for one lot of work and all my attempts have resulted in the SO rows and the PO rows being linked together (see pic).  The problem with this is that we want to use grouping and summarizing and it is obviously then giving false results.  I feel like I should know how to do this but I am going round in circles… can anyone help?