workflow DECISION outcomes corrupt the .mpr (load-time crash, NOT a CE)

[marclehane-creator]

Still reproduces verbatim on 0.21.0 — the fifth release running. Re-measured 2026-09-07 on a fresh mxcli new --version 11.11.0 app: check passes, exec exits 0 ("Created workflow"), DESCRIBE WORKFLOW round-trips, and mx.exe cannot load the project — no N errors. line at all.

Found 2026-06-10 probing workflow authoring on v0.12.0 AND nightly-20260609 against a fresh mxcli new --version 11.11.0 app.

Summary: decision … outcomes 'A' -> { } 'B' -> { }; inside CREATE WORKFLOW passes check, applies via exec ("Created workflow"), and DESCRIBE round-trips — but the outcome captions are stored as EnumerationValueIdentifiers. The .mpr then fails to LOAD in mx.exe / Studio Pro: Enumeration value condition outcome in workflow 'X' has an invalid value 'B' for property Value. The text 'B' is not a valid EnumerationValueIdentifier. (UnitLoader crash, full stacktrace). This is worse than a consistency error — the model is unopenable.

Root cause (apparent): the MDL grammar has no condition clause for decisions (mxcli syntax workflow decision shows none), so there's no enumeration/boolean/expression to bind outcomes to; mxcli stores raw caption text where a qualified enum-value reference belongs.

Recovery: mxcli -p <mpr> -c "DROP WORKFLOW Mod.Flow" still works on the corrupted unit (mxcli's own parser tolerates it) — model loads again after the drop.

Minimal repro:

create persistent entity Mod.R (Title: String(50));
create workflow Mod.F
  parameter $R: Mod.R
begin
  decision 'Check' outcomes 'A' -> { } 'B' -> { };
end workflow;

mxcli exec clean → mx check (11.11.0) → UnitLoader crash on load.

Probe verdict on the REST of the workflow grammar (same session): GREEN. Param + call microflow (parameter mappings auto-wired with (Request = '$WorkflowContext')) + user task (page/outcomes/nested activities) + parallel split → mx check 0 errors on 11.11.0. Two modeling requirements (not bugs): every user task needs a PAGE, and that page's param must be System.WorkflowUserTask (CE7412), not the context entity. Decision-outcome arrows are 'X' -> { } (the built-in syntax example omits the ->).

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mxcli 0.21.0 (mxcli-windows-amd64.exe, 2026-09-06 build), Mendix 11.11.0 / 11.12.x, Windows 11. Each item was re-measured on a fresh app with a control of the same construct type, and every mx check verdict is the literal The app contains: N errors. line. We keep the full register with repros in our repo; happy to share more detail.