Informix Error -4023: A class cannot derive from itself.

Cause and resolution

A class cannot derive from itself.

This CLASS statement asserts that the class is DERIVED FROM itself. This action is not supported. Either remove the clause, or name another base class.

Oninit® Troubleshooting Guidance

Reasons / Common Causes

-4023 fires when a CLASS statement declares a class as DERIVED FROM itself — per the official guidance, this self-inheritance isn't supported.

A class's DERIVED FROM clause naming itself as the base class, per the official guidance — the direct, only cause.

Solutions / Resolution

Remove the DERIVED FROM clause, or name another base class, per the official guidance.

Examples

A class deriving from itself

CLASS Order DERIVED FROM Order
  ...
END CLASS

Corrected

CLASS Order DERIVED FROM BaseRecord
  ...
END CLASS

Diagnostic Checks

Check every DERIVED FROM clause, and confirm the named base class isn't the class itself.

Related Errors / Related Topics

No closely related error codes are cross-referenced for -4023 in this set yet.

A class is declared DERIVED FROM itself — remove the clause or name a genuine base class.