To populate Segment data to Order item level in additional tab B

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Hi Experts,

I am working on Inbound interface using IDoc (ORDERS05); during Idoc process IDOC_ORDERS_INPUT; i have to take segment value and need to populate at order items level; in custom field (in additional tab B).

For that i am using FM (Customer exits) :

Step 1- EXIT_SAPLVEDA_001 (Getting segment value and passing to XVBAP-Zfield).

Step 2- EXIT_SAPLVEDA_002 (Passing Value to respective screen using BDCDATA table).

Due to unable to find where i have to set flag and how ?; To avoid multiple record to append ; BDCDATA Table with same screen.

As mention in this link for Header level additional tab B : http://www.sapfans.com/forums/viewtopic.php?f=21&t=62945#p1025880.

They are using my_flag to avoid ,issue as i mention in above step.

Step 3 - At last they are deleting my_flag in FM : EXIT_SAPLVEDA_003. (find in above link)

Thanks in Advance

Regards

Vinay