Discussed in Telco:
NULL would be the best choice.

We should extend the description in the ConditionType.

We tried to implement it with NULL but it is difficult since there is a difference to the DA representation.

For DA access we have defined:
'Other properties may no longer provide current valid values. All Variables that are no longer provided shall return a status of Bad_ConditionDisabled'

But we take the information from the same source and the event fields would return Bad_ConditionDisabled instead of NULL.

We should make this consistent and allow also Bad_ConditionDisabled for the event fields

in meeting Agreed to allow both null and Bad_ConditionDisbaled

Fixed text to include NULL and error in the event

Agreed to changes in telecon.