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The 'Property::CompatibleDefaultExpression' constraint is violated for xxxxx [message #1755185]

Tue, 28 February 2017 18:05

Fy Za

Messages: 245
Registered: March 2010

Senior Member

I have this metamodel (subset)

		abstract class Entity
		{
			property parts : Part[*|1] { ordered composes };
			property elements : Element[*|1] { ordered derived readonly }
			{
				initial: self.parts.element;
			}
		}
               class Part
		{
			property element : Element[1];
		}

When I added

			{
				initial: self.parts.element;
			}

I warning is appeared

Quote:

The 'Property::CompatibleDefaultExpression' constraint is violated
for 'dsm::Entity::elements'

Why this warning appears? any suggestion?

thanks

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Re: The 'Property::CompatibleDefaultExpression' constraint is violated for xxxxx [message #1755187 is a reply to message #1755185]

Tue, 28 February 2017 18:57

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

Difficult to be sure without a repro, but almost certainly

The 'Property::CompatibleDefaultExpression' constraint is violated

i.e. initial: self.parts.element is not compatible with property element : Element[1]

which looks rather likely since I suspect that self.parts.element is an implicit collect: self.parts->collect(element) and so a Bag.

Try using the editor hovertext which will tell you what the types are.

Regards

Ed Willink

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