Informatica Aggregator Errors – Error number EXP_19183

Error Message : EXP_19183 User-defined function <user-defined function> uses an aggregator function.

User Defined function (I hope you know what it is, if not check the link) is used in expressions to reuse expression logic and build complex expressions. In a user defined function if you use a Aggregator function then you will get the above error.

So better not to use Aggregator Function in the User Defined function syntax.