TeamGrid should have an accounting app with integrated proposal and invoice creation.
Die Abrechnung gebuchter Zeiten sollte Verrechungseinheiten berücksichtigen
Offer and Invoice System to create invoices and offerts for the customer. Take the Time entries and convert it in an invoice with HBCI-Balance to check if the customer have payed the invoice.
I guess a very good integration to easybill e.g. would be enough. At least for us. ;-)
Will this feature include expenses? Will there be an opportunity to export (DATEV)?