Validation library is not listed in the File Cabinet node in the DocuWare Administration

Behavior:
After registering a validation library in the DocuWare Administration (<Organization> --> General --> Validations) the validation is not shown in the File Cabinet (<Organization> --> File Cabinets --> <File Cabinet> --> General --> "Validation").

Solution:
This behaviour occurs if the declared fields in the validation's source code do not match the fields of the File Cabinet. Please check whether the internal field names (also known as column name) of the File Cabinet's fields match the entries in the method DeclareFields(). Additionally the given field type has to match the file cabinet field's type.

public override void DeclareFields()
{
DeclareField("COMPANY", ValidationFieldType.Text);
}