customer payments graph

[Tatar Kolos]

Hi Gnucash experts,

I'm trying to generate a graph which would show me a cumulative line (or 
bar) graph of invoices I created for a given customer plotted over a 
cumulative line (or bar) graph of payments I received from a customer.

This would show me how well a customer is keeping up with payments.

This information is there, I can see it in a table form in the customer 
overview report.

Any suggestions on how I can generate this graph?

Thanks,

Kolos