Do you have invoices that are pending approval?  Did you setup the Approval Routing feature? Are you using an approval workflow? I recommend starting with “Custom Workflow Based Invoice Approval” SA Answer Id: 9191 and “Using the Approval Routing Feature” SA Answer Id: 11109 for some initial reading.  Sorry it’s not a better answer, but there’s a lot of details missing from your question that makes it hard to answer definitively. If you poke around a bit SuiteAnswers should be able to guide you through the basic setup regardless of what approval path you’re looking to follow.  Hope that helps!