Thanks for that, nice to have an official answer
Will num start at 1 again at the beginning of each month ?
For the number padding, I haven't found an official docment that states that it's obligatory, in 2007 our accountant told us we had to choose the right number of digits corresponding to roughly our sales estimates + 1 or 2 zeros.
One thing for sure we can't change numbering scheme during the year so a move to blesta without editing core files woud have to wait for 2016.
There are a few things that make us wonder if blesta will suit our needs, as our general impression is that blesta was not initially designed for medium/large companies and you are adding new features to accomodate them.
I will have another look when blesta 3.5 comes out, we are curretly working on pieces of code that could be implemented as plugins for blesta for some very specific suppliers. We will see if we plug them in to our custom system or into blesta if blesta's developement evolves in the right direction fast enough to reassure us.
I must admit the community is great and definitly loves the product.