This table is used by Forms applications that are generated from Oracle Designer. It contains valid data values for each Domain defined in Designer. For example, if you have a domain called 'Sex' that can have the values 'M' or 'F' then cg_ref_codes might contain:
RV_DOMAIN RV_LOW_VALUE RV_HIGH_VALUE RV_ABBREVIATION RV_MEANING
SEX M <null> ML Male
SEX F <null> FM Female
The abbreviation or meaning can be displayed in poplists etc. in the generated Form to select the appropriate value.
The RV_HIGH_VALUE column is used for range check domains. For example, if there were a domain called 'Salary' that can have values between 1000 and 100000, then cg_ref_codes might contain: