Visual Ribbon Editor

I am wanting to hide a button based up on a field value, so using the visual ribbon editor I set a rule for th ebutton as follows:

Field: QuoteNumber

Value: QUO-01860-H9C3

The field is the name of the field in the back end database and I can see the value in the database under this field.

If I upload this to my CRM nothing happens, the button is not displayed.

If I change the rule to a client type and select Web the button is visible.

So my assumption from this is that the value or field are not getting evaluated correctly, anyone give me an idea as to what I am missing?

regards,

Matt