We use Project accounting to generate all sales invoices and credit notes. This means you have to jump form sales ledger to project accounting if you need to reprint or credit note You cannot reprint invoices & credit notes while Sales ledger - Customer transaction enquiry. I believe this only works if you generate invoices and credit notes from Sales ledger or SOP. There should be a direct link form customer transaction enquiry screen to reprint invoices and credit notes in project accounting