Create a custom extension with three different dimensions as feed input

Hello.

Is it possible to create a custom extension with three difefrent dimensions as feed inputs, and use them all three at the same time.

The problem I face is that I can only use two as the same time, because the third always get disabled automatically.

Here are screenshots.

As soon as ABC and GHI inputs are filled DEF is automatically disabled.

And so on...

Is it a limitation?

I need this because I want to be able to emulate "alphanumeric measures".

I see it's possible in some built-in charts

Also, on the code side, I don't under stand this :

var ABC= {     id             : "my.extension.test.module.TEST.DS1",     name           : "ABC",     type           : "Dimension",     min            : 0, // and this??     max            : 4, // what is this??     aaIndex        : 1,     minStackedDims : 0,     maxStackedDims : Infinity  };

If I put min to 1 on each of my dimensions I try to build, Lumira triggers an error "cannot have more than two axis".

I don't have access to HCP develoment platform.

Thanks by advance.