Are you sure?

Haroon145 has managed to do it and also quoted in the headforpoints link above,

"In theory, there are no rules on backtracking. One example I saw was basically multiple holidays from London to somewhere, back to back, to get to eight sectors! It seems that you can book, say, London to Qatar and home, London to Hong Kong and home, London to Tokyo and home, London to Kuala Lumpur and home as one booking – as long as you are using at least two oneworld carriers – and save a huge number of Avios on booking four holidays separately!"