Action setting a variable as dimension

[canmarroig]

Hi, i need to create a button with an action:

if i want to set my date  >= to a certain variable i can find my data set ='>='&'$(vMaxDate)'  

if my date is only = to my variabile there's no action                             ='='&'$(vMaxDate)'  

Can you help me?

Tks

[canmarroig]

I've found, it's possibile only if i set

=date(vMaxDate)

vMaxDate is a numeric date, but i still guess why

='>='&'$(vMaxDate)'

run correctly

Thank you!