Change invoice numbering format

How can i change the invoice numbering. i tried to change from the modules setup of invoices, but it brings the “error on mask”.

Hello,

Yes it is the right place to change it, but of course you need to respect a certain syntaxe.

whats the syntax for the correct format

Just open the help next to field and you will have the information
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Thanx, that worked out.

How can i write invoice total in words?

downloaded and added to the modules, but cant see any amounts written in words anywhere

Thanx, figured out.

Whats the meaning of lines to bind and lines bound and what the purpose for that