I am able to filter by "like" in an aggregate.  This statement works:
AuditRequest.Attribute like "%Id%"

I am not able to use "not like".  This statement causes an "Unexpected 'not' in expression" error:
AuditRequest.Attribute not like "%Id%"

What syntax should I use in an aggregate to filter by not like?

Thanks.

You cannot use the "not like" operator in Aggregates:

http://www.outsystems.com/help/servicestudio/9.1/index.htm#t=Language_Reference%2FExpressions%2FExpression_Operators.htm


You can use it within a SQL element if you must use the Not Like expression.

I discovered that you can use "not" with "like".  Instead of "not like", use not(...like...)

Here is an example:
not(AuditRequest.Attribute like "%Id%")

Thanks for the tip Karen, very useful!