How can the Default Value of an Attribute be set to empty? Not all Attributes need a Value, and the user shouldn't have to 'delete' Values for irrelevant Attributes.
Leaving the Default Value empty, results in error message; even when having an empty field in Constraints \ Allowed Values and Required is not checked.
We would like to use the same solution for all types of Attributes (Integer, Real, Real with Unit, String)
Solution we have found so far is to use '-' for String type Attributes and '0' for Integer, Real and Real with Unit Attributes.