Set analysis 3 last campaigns Dinamico

[cristianj23a]

Hi.

I am creating a line graph, to visualize the last 3 campaigns according to the filter that is made.

The issue is that qlik does not recognize my code in set analisys.

In the image that I show is of static value,

and in the following it is dynamic.

with the following code.

sum({<DESC_CAMPAÑA={"=('CAMP '&(Max(Num(Right(DESC_CAMPAÑA,4)-1))))"}>} ZPSOS02_CANT_PRES)

Help me identify what is missing from the code please.

I attach a test qvw.