Hi Anil,
if you implement in PR05 one receipt- and scroll you will see that there are now 51 receipts as default possible.
If you copy the receitp- you can do this- till 999.
(The relevant structure for receipts is PTK03 (se11) The first component is called BELNR- it has a field lenght of '3'. So 999 receipt(numbers) should be possible.
But I never saw this in a real business trip :-)
BR
Klaus