It is possible to define for which time period a certain field value is valid for person information. This makes it possible e.g. to save future person information changes advance. You can find more information here. Person information can also be imported with validity information.
The method used for importing validity information depends on the source system of the imported data. All source systems do not support importing data with validity information.
There are three different methods of import concerning validity information:
The "Default" person import type which can be used, for example, in manual person import, supports importing without validity information and with Valid from information. The support for methods of validity information import varies depending on person import type and the source system of the imported data. You can find more detailed information about supported methods of validity information import in the person import type specific guidance.
There must be values for mandatory fields for all times even after person imports.