Unfortunately this does not work out.

['&',('date_due','<', ((context_today() + relativedelta(weeks=0,day=7, weekday=-1)).strftime('%Y-%m-%d'))),('date_due','>', ((context_today()).strftime('%Y-%m-%d')))]

Does show no invoice

[('date_due','<=', ((context_today() + relativedelta(weeks=0,day=7, weekday=-1)).strftime('%Y-%m-%d')))]

Does show only the invoices that are due before today but not the invoices which became due in the next 7 days.

• relativedelta(days=7) is correct, sorry

Thanks! I modified it a bit and this works:

[('date_due','<=', ((context_today() + relativedelta(days=7)).strftime('%Y-%m-%d')))]