Attribute 'sourceType' is not allowed to appear in element 'Subscription'.

Hi,

I was trying to include few of my entities in custom extension. The workflow is easy:

Reproduce:

Create Thing -> Add Subscription (me:ThingStart) -> Export as Source Control Entities -> Add to Entities folder in extension sources -> Try to import extension -> ERROR

Attribute 'sourceType' is not allowed to appear in element 'Subscription'.

In MyEntity.xml file there is actually this attribute: sourceType: Thing. 

After deleting it it is working perfectly.

It's bug or I'm missing something?

Thanks,

Adam