vRA 7.4 Custom Forms and external values

Hi,

I want to do the following:

Use the CPU field in a Custom Form and then give it a maximum that depends on a vRO value.

So I use an action in vRO that returns type Number and just does return 4; nothing fancy just testing at this stage....but the error throws me.

My Blueprint has for CPU values between 1 and 16 so I get where it comes from but that smells like a bug to me.

Anyone any Idea?