Urgent- populating data in segments of DELVRY03

Hi experts,

I am populating data in segments of DELVRY03 where i am using DELV process code along with message type SHPORD.

For this iam using EXIT_SAPLV56K_002.

As i am populating many segments I am using case statement, but IDOC_DATA-SEGNAM is empty.

Please help as i am struck here.

Waiting fo rreplies,

Thanks