Concatenated list of previous selection or "All" using set analysis?

[felix18807]

I have a text box that displays the list of current selections next to a chart. The syntax I use is below. The key thing this also does is state "All" if the field is has no selections. What I want to do is do exactly the same but with the previous selection. I feel this should be possible using set analysis but thus far I have been unsuccessful in producing this effect.

Has anyone achieved anything like this?

=

if(isnull(GetFieldSelections(NodeName)),

'Current Group ' & chr(10) &
'‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾' & chr(10) &
'All',


'Current Group ' & chr(10) &
'‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾' & chr(10) &
chr(183) & Capitalize(Concat(Distinct NodeName

, chr(10) & chr(183))))

[felix18807]

Argh just tried this

=

if(Count

({$1}NodeName)=Count({$1<NodeName=>}NodeName)
,
'Previous Group ' & chr(10) &
'‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾' & chr(10) &
'All',

'Previous Group ' & chr(10) &
'‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾' & chr(10) &
chr(183) & Capitalize(Concat(Distinct {$1}NodeName, chr(10) & chr(183))))

And it seems to work....