[news.eclipse.technology.gmt] MOFscript ecore package

[user@xxxxxxxxxxxxxx]

Hi everybody,
I want to reference a class of an ecore metamodel which is contained in 
a package as the invocation type for a rule:

my_metamodel.My_Class::rule(){}

where My_Class is in package P. I get the error:

Error: MTTParseError: Undefined type for metamodel ( my_metamodel ): 
My_Class, line: 0, column: 0

There's a workaround or am I forced to move all the classes to the 
default package?

Thanks