OTOS synchronizes databases by adding and changing data. To ensure correct synchronization, only one user at a time may edit a specific piece of information. This requires well-organized document types and user authorizations for them. Each location that needs to be synchronized should have its own document types, i.e. separate from other locations.

The chart below show an example of such an organization of document types.

The main office and all the stores have their separate warehouses and document types for receiving (shipping) and issuing goods (sales), and for cash in and out. If all locations should handle orders, suitable document types have to be defined. A layout like this allows each location to function independently and administer their own database. With well-defined user authorizations, this system is reliable and autonomous. Otherwise, errors in document numbering could occur.