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This functionality is found in the Format Editor>Field Properties section.
These settings are used during an import to set a Cartegraph field in every imported record to a single specific value.
The setting has the Use Special Function check box and the Use Data Value field.
If the Use Data Value setting is selected, the import puts the value specified in the Data Value field into the appropriate field in the record. If the Data Value field is left empty when the Use Data Value setting is selected, the action taken is determined by the When an existing record is updated Run Property.