Each new recipient is automatically assigned a datasource ID by the EMM. This ID logs which data source was used to enter the recipient into the EMM database for the first time. This information cannot be deleted, changed or overwritten. The datasource ID is uniquely assigned to a data source, e.g. import, DataAgent, WebService, registration form. Each import process gets its own ID in order to be able to determine the time of the import. If an already existing record is transferred to the EMM again, the last update process can always be traced via the field latest datasource ID.