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LDC-E8203 — Unknown or repeated label slot

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# LDC-E8203 — Unknown or repeated label slot

## What it means

A label can carry grammatical forms beside the official wording, one per
morphological slot of the label language: genitive, dative, and the rest.
Each slot name comes from a fixed per-language vocabulary, and each slot
may appear only once — the first form wins. A slot outside the vocabulary,
or a second form under an already used slot, is diagnosed at the offending
form while checking continues.

The finding is a warning: the check keeps a zero exit. Rename the unknown
slot to a vocabulary name, or drop the repeated form, and the warning
clears.

## Example

```law
language "law.core" version "0.2";
package demo.diag version "0.1.0";
namespace "urn:law:demo:diag";

entity Person {
    label ru-KZ official "Лицо" {
        vocative "Лице";
    }
}
```

## Fix

```law
language "law.core" version "0.2";
package demo.diag version "0.1.0";
namespace "urn:law:demo:diag";

entity Person {
    label ru-KZ official "Лицо" {
        genitive "Лица";
    }
}
```

## Engine message

The engine reports this in its own wording:

```text
example.law:7:9: warning LDC-E8203: unknown morphological-form slot "vocative"; known slots "ru-KZ": genitive, dative, accusative, instrumental, prepositional, genitive_plural, dative_plural, accusative_plural, instrumental_plural, prepositional_plural
```

## Related

- [Vocabulary](/constructs/vocabulary/) — how names are declared and which positions take them.