The series refer to the serial number prefixes of each document issued by HioPOS Cloud. These are used to distinguish between documents.

To modify the series, go to the option Terminal English Settings.

There you can freely modify the series, as long as it is not already in use. Select on the left side another terminal to modify it from the current terminal.

The series I use will appear in the documents, followed by a hyphen and the document number, always starting with number one and increasing by one.