Problem in VL01N call Transaction

Hi Friends

I am using BDC program to create delivery from sales order.

Whenever I execute the program its creating delivery for first sales order in the loop, But second time Its not creating delivery/Trwoing error message.

Simply call transactio ends without any message(Success or failure).

I used all the clear statement

First Record :

Row PROGRAM DYNPRO DYNBEGIN FNAM FVAL

1 SAPMV50A 4001 X 

2  0  BDC_CURSOR LV50C-VBELN

3  0  BDC_OKCODE /00

4  0  LIKP-VSTEL US10

5  0  LV50C-DATBI 26.11.2012

6  0  LV50C-VBELN 15652

7 SAPMV50A 1000 X 

8  0  BDC_OKCODE =SICH_T

Second Record :-

1 SAPMV50A 4001 X 

2  0  BDC_CURSOR LV50C-VBELN

3  0  BDC_OKCODE /00

4  0  LIKP-VSTEL IE30

5  0  LV50C-DATBI 26.11.2012

6  0  LV50C-VBELN 15653

7 SAPMV50A 1000 X 

8  0  BDC_OKCODE =SICH_T

Kindly help me to fix this issue.

Thanks

Gowrishankar