Removing selection for concatenated field

[Intuitive]

Lets say, I have  four fields:

branch_id

branch_name

date 

sales

On the chart I used branch_id&' -'&branch_name to display a branch 

On the same sheet I have a KPI that I want to be able to alter by selecting dates but not to be altered if branches are selected on the chart

I used sum({$<branch_id=>}sales), it didn't work. 

sum({$<branch_id=,branch_name=>}sales), didn't work. 

sum({$<branch_id=,branch_name=>}sales), didn't work. 

sum({$<branch_id=,branch_name=,[branch_id&'-'&branch_name]=>}sales), didn't work

GetCurrentSelections() results to "branch_id&' - '&branch_name:100-main branch"

If I change the field on the chart from branch_id&' -'&branch_name to branch_id

then sum({$<branch_id=>}sales) works.

[bramkn]

Using concatenated fields can cause some strange behaviour. The best way is to create a new field with these 2 fields combined in the script instead of the dashboard.