Credit note in st 3

Sir,

One of my client is registered under s tax under the category business auxiliary services. he raised invoice of Rs. 22.00 lacs in june 2012 and paid s tax (Rs. 2.72 lacs) there on. consequently return for 1 st qtr was also filed accordingly. In august we found that out of 22.00 lacs only 16.00 lacs have been realised and balance amt (Rs 6.00 lacs and s tax od Rs 0.74 lacs) have been reversed through credit note .

Now my query is how to show Excess service tax of Rs 0.74 lacs in new st 3 for 2nd quarter so that i can claim cenvat of this amt in future. please help, its urgent