How to add message dependencies if they are located in the same package? [closed]

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Hi everybody, imaging you have two messages defined in the same package my_package_msgs and one of them is dependent on the other:

For instance:

• foo.msg:
  • geometry_msgs/Point position
• array_of_foo.msg
  • my_package_msgs/foo[] foo_array

When the package is compiled this error appears:

Could not find messages which 
'/home/user/../my_package_msgs/msg/array_of_foo.msg'
depends on. Did you forget to specify generate_messages(DEPENDENCIES ...)?

Thx.