KPI chart and dimension for max value

[Peony]

Hi all.

I have a table like this one:

Layers:

Load*Inline [

Layer,    Amount

L1,          3

L2,         12

L3,         6

];

I have a KPI object to show Max(Layer) value. And I want to show as a label for this expression for which layer name this expression is related. Now it will be L2, but the next reload it may be the other one. So I need some dynamic in the label name. 
Can someone tell how to create dynamic label?

[dplr-rn · Accepted solution]

try this as title expression

=FirstSortedValue(Layer,-aggr(Max(Amount),Layer))

[Peony]

Thank you for help. It works. 
Can you, please, explain why there is a minus before Aggr? 

[dplr-rn]

Aggr creates a virtual table and if you dont have minus the layer with least will be returned by first sorted value.

[Peony]

Understood. Thank you👍!