When i switch from object to edit mode, the model changes the position. What i found out so far is that this is related to the "rest position". http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro/Advanced_Tutorials/Advanced_Animation/Guided_tour/Armature/object
But how can i change the rest position to look the same as the object position? Because if i change the rest position the object position changes too, thus always a margin of differences... can i just copy past the object position into the edit position/rest position?