There are certain Populations you will not be able to create, these are largely negative cases. For Example looking for all of the people who didn’t do an event. We consider these cases too generalized, you will need to add a positive condition so you can run your populations.

AND operator, and ALL of its operands are negative.

You cannot create a population in which all operands are negative, this includes:

Has Not Done Event

Does not have Property

To use the population you will have to use at least one positive operand.

Configuration type	Result
Has Not Done	No
Has Not Done AND Has Not Done	No
Has Done	Yes
Has Done AND Has Not Done	Yes

OR operator, and has negative operands

If you use an OR operator - it is like each OR condition is its own independent condition, so each OR condition will be subject to the rule above. If you use the OR operator you cannot use a negative operand.

Configuration Type	Result
Has Done OR Has Not Done	No
Has Done OR Has Done AND Has Not Done	Yes

Frequency of Occurrences

You cannot set an Event Occurrence to Zero if it is the only step condition of the population.

You cannot Occurrence to:

At Least 0 times

At Most 0 times

Or Exactly 0 times