National Parliaments Are the Only Legitimate Rulers

From today's Open Europe news summary:

In an interview with German news agency DPA, Open Europe Director Mats Persson argues that “reforming the EU is the best way to preserve it; in fact in the long run it may be the only way. It should be clear to everyone that the status quo in Europe is not an option. He calls for “strengthening the role of national parliaments...a veto right for national parliaments on European decisions if more than nine parliaments are in agreement.”DPA

Why should a national parliamentary veto require that "nine parliaments are in agreement"?  Why should some EU policy that is injurious to only one nation, such as the proposed financial transaction tax is to Britain, require the consensus of eight other national parliaments?  This smacks of two wolves and a lamb voting on what to have for dinner.  Mr. Persson needs to take his insight to its logical conclusion; i.e., that national parliaments are sovereign and do not need the approval of other nations' parliaments for exercising legitimate rule.