What are upgrade licenses of SAP Business One?

Licensing update SAP Business One used to make the initial investment of limited licenses to full licenses.

That is, if you have a license for SAP Business One Financial Limited is licensing is limited to be used in certain settings for the financial module, and if you would like to control the whole program should be professional license.

So there is this upgrade licenses to expand the program and make the investment in the previous license and not having to invest in all of the full license again.