This contribution discusses the symmetry in the attribution of taxing rights of income and capital gains/capital in a historic context. It describes the unsolved hierarchy problems that were introduced with the introduction of article 13(4) in 2003. Article 13(4) has also disturbed the previously balanced coordination of articles 7 and 13 in paragraph 4 of the Commentary on Article 13. The contribution criticizes the late (2010) introduction of the new Commentaries explaining “effectively connected with” and “forming part of the business property of” a PE.