drawing param in a repeat region relation

[vlad1979]

I created a repeat_region like below with a summation option.


View attachment 2864


In a cell I need to show total_length * 1.2


I'm thinking because I can't create a relation in a drawing, to create a simple repeat region with only one cell in which to put rpt.rel.PERCENT, and write a relation for that repeat region like PERCENT=1.2*summation but it doesn't work.


I noticed that summation is a drawing parameter (real_number), that I can show in a drawing like &summation:d


Any idea how to use a drawing parameter in a repeat region relation? Is it possible?


Thanks.