unfortunately, I can't see your attached table, could you check this please?
Please note that the Help states about FirstSortedValue:
"...If more than one value of expression share the same lowest sort-order, the function will return null...."
Could this be a problem with your data?
What an idiot!!!
THIS time I will attach the file.
I suspect, Stefan, that you are right, but I'll let you have a look.
Example.xls 34.0 K