Property:Has improper value for

__NORICHEDITOR__ This is the built-in property "Has improper value for". It helps to keep track of input errors in a wiki when values that are assigned to some property are invalid. This property is set automatically.

The property connects a page where some invalid input was given to the property to which this value was assigned. Thus, it can also be used in inline queries or on Special:SearchByProperty to find all pages where an error occurred for a particular property. Also note that even errors that appeared when using some SMW special property are recorded.

Has improper value for can be used for wiki gardening and maintenance, and it is also employed by SMW for automatically repairing its records after the datatype of some property was changed.