Key fields

Each class must have a key attribute (the field "key" of the main part of the meta class). Without this, the application will not function.

Types of key fields

1. Guid - “Global identifier [12]”.
2. “String [0]”.
3. “Integer [6]”.

Key attribute requirements

When creating the key attribute meta, set the "unique" and "autoassigned" fields to true. Disable the empty value by setting "nullable" to false.

If the attribute is not generated automatically, then "autoassigned" can be set to false, then the field must be set by the operator when creating. For example, if it is a classifier code or registration number that is specified externally (on paper).

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