Using XML import sets Use an XML import set to import data from another instance. This method allows you to: Apply business rules Transform incoming data Reconcile sys_id values if necessary Note: Administrators cannot set the update_synch attribute in Dictionary records to move data as part of update sets. This attribute was being used incorrectly to migrate data in large tables and was causing significant performance problems. Create an XML data source to another instanceData sources are used to create an import set so that data can be processed, if necessary, prior to being mapped onto a production table.Create a transform mapA transform map is a set of field maps that determine the relationships between fields in an import set and fields in an existing ServiceNow table, such as Incidents [incident] or Users [sys_user].Add a field map for sys_idAdd a field map to establish a relationship between the sys_id field in the source table (defined in the transform map) and the sys_id field in the target table. Add onBefore scripts to the transform mapCreate one onBefore transform map script to copy the sys_id of new records from the source to the target instance. Create a second onBefore transform map script to identify records on the target instance that have the same unique values but different sys_id values.