Good Code Practice - Why does eClipse force us to use “only lower-case letters, numbers and !” for Token name?

Ok, I am using GWTP on eclipse. When creating a Presenter using eclipse & when I enter a token name say "!manageOrder" then eclipse show an error that "Token name must contain only lower-case letters, numbers and !". See the following picture.

However, in the NameTokens class, there is a line:

public static final String manageorder = "!mnageorder";  

We can change to lowercase or upper the system is still ok.

So why does eClipse force us to use "only lower-case letters, numbers and !" for Token name?

if i use "!manageOrder" then it must easier for customer to figure out the what the page is right?

also: http://stackoverflow.com/questions/23078540/good-code-practice-why-does-eclipse-force-us-to-use-only-lower-case-letters

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