Sage Timeslips

I know that we are usually able to undo the last month's bill but I am unable to do so for some reason. I forgot to "revise date" for our last invoice so our client is asking us to amend the bill to say July 01, 2015. However, I cannot undo the bill as…

I am new to Timeslips. I ran our bills for the month of May but did not "approve" them. When I figured out how to approve them it is now showing the last billing as of today. I am afraid when I run our June bills they will start from today and not the…