Entities need to be unique within their containing scope

[vishwacsena]

This should not fail

@ prebuilt number hasRoles Quantity
 
@ ml foo = 
 - @ number number

[vishwacsena]

Also verify this works.

File1

@ prebuilt number
@ ml AddToProperty =
    - @ number number

File2

@ prebuilt number
@ ml AddToProperty =
    - @ number number