[news.eclipse.modeling.gmt.amw] feature e does not exist on

[kornev <y.kornev@xxxxxxxxx>]

Hi,

i tried to define some transformation rules with Atl and was stumbled on 
the following:
(exerpt)
module CPMMWeave;
create OUT : MOF from IN : AMW, interbase: MOF, structurebase: MOF, 
advice : MOF;

helper context MOF!EModelElement def: isStBase : Boolean = 
MOF!EModelElement.allInstancesFrom ('structurebase')-> exists(e | e = 
self );

rule CopyStClass {
	from
		be : MOF!EClass (be.isStBase)
	to
		out :  MOF!EClass (
			name <- be.name,
		)
}
if i run this littel fragment i get
****** BEGIN Stack Trace
	message: feature isStBase does not exist on interbase!EClass
A.main() : ??#32 null
	local variables = {self=CPMMWeave : ASMModule}
	local stack = []
A.__matcher__() : ??#1 null
	local variables = {self=CPMMWeave : ASMModule}
	local stack = []
A.__matchCopyBaseInteractionClass() : ??#31 23:34-23:45
	local variables = {be=interbase!EClass, self=CPMMWeave : ASMModule}
	local stack = []
****** END Stack Trace

has someone any idea why this is happing,
 i run other examples found on the homepage in works fine,
but here i do not understand, why Atl does not recognize that  interbase 
conforms to the MOF(Ecore) model and cannot apply isStBase rule?