Min Value where another attribute has a value

In the attribute creator you can create a conditional value which will allow you to use logic like you’ve mentioned above
 

Here’s some documentation (old version but still applicable) on conditional values - https://safe-software.gitbooks.io/fme-desktop-advanced-training-2016/content/DesktopAdvanced5Attributes/5.04.ConditionalValues.html

@hkingsbury I have already created the attribute, but I want to filter out the data since the list exploder made many ‘duplicates’. The logic I want to use to filter is when the “Review Status” has a value take the lowest “_element_index” that contains a “Review Status” ELSE take the lowest “_element_index”

@hkingsbury I updated the question to make it a little more clear.. i think 😅

Are you able to provide some examples using a sample of the data that you have? An example of the ‘input’ data and an output of what you’re wanting to achieve

@hkingsbury Here is a super simple version. I want to take the lowest “_element_index” that has a “Review Status”, if “Review Status” is empty just give me the lowest “_element_index”

Taking the data step back (into when its a list) you can just use a ListSearcher to achieve what you’re after.
 

I’ve also attached the above workbench (2023.1)