PLS-00588: unqualified instance attribute references allowed only in member methods

Cause: An attempt was made to use the name of an object instance attribute in the body of a static method, or in an initialization default value on another attribute. If the instance attribute is not qualified with a particular object instance that supplies a value, the instance attribute can be named only when it is inside a member method.

Action: Qualify the attribute reference with the name of an object value, or change the containing method to a member method rather than a static method.

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