In order to provide a number to each document issued, you can create Numerators
(Settings - Document Numerators -Add Numerator)
Every type of document has to be linked with a numerator. The same numeration can apply to various document types.
You can manually reset to zero each numerator to start a new numeration (at the beginning of a new season or tax year for example).
Each numerator requires:
Name: Name of the Numerator (e.g. Invoice, Receipt)
Format: Format of the Numerator. It can include "Number" and "Sequence". These values will be replaced by the corresponding number of the numeration and the year when the document was issued.
Sequence name: sequence name of the numerator, e.g.: 2016 (year).
Click on Edit
and then Reset to Zero to start a new numeration.