In the DATEX-Tool, it is not possible to restrict the multiplicity of an attribute, which is mandatory (at least I suppose this is the point). Example: 'accidentType' has multiplicity 1:*. It is not possible to change it to 1:1, which should be possible according to the rules. The Tool does not accept the value 1 - it does block any further action in this case, until the 1 is deleted again. Note: This problem differs from the one described just before.
This was a bug. There was a rule that proably should prevent setting something to 0..0. However, 0..0 is valid XML. Now this rule is removed and now you can limit a mandatory (1..*) attribute to 1..1.
will be included in next release.
Will be in version 2.1.4563 of the tool.