Can I go for L1B PA with just the receipt number? Please respond

[srihari]

My current petition is valid until jan 2nd 2007 and I applied for my L1B extension. On an emergency I had to travel to india on Nov 06. I got my receipt number for my extension but approval is still pending. My interview is on Dec 2nd week.
Can I appear for my interview with the receipt number and the old petition which is valid till JAN 2nd?
Kindly advise.

Srihari