Define or edit data source precedence If multiple data sources are authorized to update the same table or the same table attributes in the CMDB, assign a priority to each of these data sources to prevent them from overwriting each other's updates. Before you begin Role required: admin or itil_admin About this task After an attribute is updated by an authorized data source, any subsequent updates are accepted only from the same data source or from a data source with a higher priority. Updates from a data source with a lower priority are rejected. Without data source precedence rules, data sources can overwrite each other's modifications. Note: Users with the itil role have read access to the CI identification rules. Procedure Navigate to Configuration > Identification/Reconciliation > Datasource Precedences. Click New or open an existing data precedence definition. Complete the form. Table 1. Data Source Precedence form Field Description Applies to The table that this precedence rule applies to. Data source The data source that this precedence rule applies to. Order Priority of this precedence rule within the set of precedence rules for the specified table. Smaller numbers designate higher priority. Data sources without a precedence rule are assigned the lowest priority. Application Domain that this precedence rule applies to, if Domain Separation is enabled. Active Check box to activate this precedence rule. Click Submit.