Long term contracts, often related to projects, require down payment chains with installment invoices that have to be dealed with conditional sales tax. When the final invoice comes, the installment invoices are charged off and the complete contract amount is invoiced with regulary tax. However, when installment invoices have not or not fully been paid one has to repost tax amounts manually form conditional to real. Therefore consultans often prefer to use different service-materials in sales orders instead of using the conditional sales tax functionality. We must admit that this issue has been quite a deal for many ERP-Systems including SAP. But in the meantime D365 FO (and also Business Central) remain as „premium“ financial systems that can not cope with that challenge. It would be nice to have this gap closed.