eCATT :Chaining of transactions

Hi Gurus,

I am creating a purchase cycle in eCATT. In that Purchase requisition from Shedule line data from VA01 should go to ME21n. I have a system generated purchase requisition number in the field VBEP BANFN. How to export this to next transaction? Which symbol i have to use? transporting last message previous transaction we are using &MS1. But for transporting data like this which is in shedule line data which symbol i have to use.

Please suggest me some solution.

Thanks and Regards,

Anil panguluri