estimates sales contract invoice

SUGGESTED

Is anyone else having problems getting their  sales estimates to flow to a sales contract to an invoice?  I can go from an estimate to an invoice, no problem .... however to go from an estimate to a sales contract to an invoice it will not post. I can email and print invoice however not post. I have to cancel invoice and retype it in. I have talked to " support " at least 5 times, apparently this is the way it is supposed to work...really??