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Localized version

Klíčové pole X nemůže mít hodnotu null. Pro klíčová pole definovaná u typu Název typu je požadována hodnota jiná než null.
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English version

The key field 'X' cannot have a value of null. A non-null value is required for the key fields defined on type 'Type Name'.
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Localized version
 Czech

Error category
 .Net Framework

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