PYTHONPATH is not set correctly by source devel/setup.bash

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I am having some issues with the PYTHONPATH that is set by my ROS environment.

my .bashrc contains the following lines:

source /opt/ros/jade/setup.bash
source /home/x/workspace/devel/setup.bash

If I print my PYTHONPATH in a new bash it looks like this:

PYTHONPATH=/home/x/workspace/devel/lib/python2.7/dist-packages

The PYTHONPATH contains only workspace-specific packages.

This results in failure, when trying to import the catkin package from a python interpreter (as it is for example required when importing a rosnode project in qtcreator)

I investigated this problem a little bit, and it seems as if the first sourcing command sets the

PYTHONPATH=/opt/ros/jade/lib/python2.7/dist-packages

(which is where the catkin package is found) The second sourcing command however resets the path, and only appends the workspace specific part again.

Is this the intended behavior?