Error in 'bdc_open_group

Hi experts,

i have to transfer the data using bdc_session method...

i have done the following....

perform open_group.

CALL FUNCTION 'BDC_OPEN_GROUP'

EXPORTING

CLIENT = '400'

GROUP = 'ZXMD'

KEEP = optional

USER = 'ABAP'

CALL FUNCTION 'BDC_INSERT'

EXPORTING

TCODE = 'FMCIA'

TABLES

DYNPROTAB = BDCDATA

CALL FUNCTION 'BDC_CLOSE_GROUP'

• EXCEPTIONS

• NOT_OPEN = 1

• QUEUE_ERROR = 2

• OTHERS = 3

.

IF SY-SUBRC 0.

but when i execute the program i get the error'bdc_open_group,create session not allowed,as last session is still active'.

plz help.

thnks n regrads,

Sreedhar