How can I change the default aggregation rule (such as sum) in the Default Aggregation Rule setting

Summary:

I need to change the default (sum) through default simple without sum and it isn't working in OTBI using the Worker Assignment Event Real Time SA.

Thanks

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):