"Has improper value for" is a predefined property that tracks input errors for irregular value annotations and is provided by Semantic MediaWiki
. In most cases it is caused by a type mismatch or a value
restriction. This property is pre-deployed (also known as special property
) and comes with additional administrative privileges but can be used just like any other user-defined property
|This special property is populated automatically by SMW when a value is not defined in the correct format.