Modifying Versionized Data

Efa uses tables with entries that have multiple versions with successive validity. The tables are: Groups, Waters, Persons and Targets.

In these tables, only the last version can be changed. can be changed. There are three modes of change:

1. Change contents:
   The validity period remains the same, The content of the data record is changed (e.g. new e-mail address.).
2. Change valid until:
   The end of the validity period is changed. No contents are changed, any changes entered are ignored. changes are ignored. To achieve unlimited validity, the validity date must be blank.
3. Create a new version: the 'Valid until' value of the record is value of the data record is set as specified, a new version is which is valid directly afterwards and then indefinitely as a copy of the current version. No contents are changed, any changes entered are ignored. entered changes are ignored.