Derived Value

Check that the derived value is correct

Select this check box to check that field values are derived from the current value and the value of the previous field, for example, your database may contain a thickness field, which should be the difference between the current 'To' value and the previous record’s 'To' value.

Select the table and fields from the drop-down lists and select whether to subtract or add the derived field value. Zero is used as the previous value for the first field.

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