CREATE ENUMERATION accepts duplicate value names

[retran]

Impact

Produces an invalid model. Studio Pro flags duplicate enum values as errors.

Steps to Reproduce

1. Run CREATE ENUMERATION M.E (A 'First', A 'Second');
2. Command succeeds without error
3. Two values named A stored in model

Expected Behavior

Error rejecting duplicate value name at creation time.

Severity

Medium — invalid model passes silently through mxcli.

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Discovered during AI-assisted manual testing session (2026-04-29, mxcli v0.7.0-257-ga07e7e0).

[github-actions]

Issue Triage

Summary:
The issue reports that CREATE ENUMERATION silently allows duplicate value names, producing an invalid model that Studio Pro flags as an error.

Checklist for bug report completeness

Required info	Present?	Details
mxcli version	✅	mxcli v0.7.0-257-ga07e7e0
Mendix version	❌	Not mentioned
Scenario (what was tried)	✅	Running CREATE ENUMERATION M.E (A 'First', A 'Second');
Expected output	✅	Error rejecting duplicate value name at creation time
Experienced output	✅	Command succeeds; two values named A stored
AI bug report (diag bundle or session log)	❌	Only a note about discovery; no mxcli diag --bundle or log provided

What’s missing:

• The Mendix version of the project you were working with (e.g., 10.x, 9.x).
• The output of mxcli diag --bundle (or at least the session log) to help reproduce the environment.

Could you please add those details? Thanks for the report!

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