Nested Set Analysis with max()

[braeuleinfreu]

My User_ID has several images and with this piece of code I receive the larges IMAGE_NR. 

      max({$<USER_ID = {'8638087'}> } IMAGE_NR) 

Every image number is linked to an IMAGE_ID. How do I get this?

In words:

Give me IMAGE_ID where IMAGE_NR =  max({$<USER_ID = {'8638087'}> } IMAGE_NR) 

I tried following that doesn't work:

      sum({$<max({<USER_ID={'8638087'}> } IMAGE_NR)>} IMAGE_ID)

Thank you for any thoughts!

[Vegar · Accepted solution]

You could try this expression a try:

only( {< IMAGE_NR = {$(=max({$<USER_ID = {'8638087'}> } IMAGE_NR))} >} IMAGE_ID)