User exit and routine FV50C302

HI all .

I need to populate Picked quantity automatically in VL02N when i created STO via ME21N.Already Confoguration done for automatic delivery.in FS their given routine FV50C302,how can handle this routine?

I found User exit for ME21N ie Enhancement : MM06E005

USER EXIT : EXIT_SAPMM06E_013

Include : ZXM06U44

but i need to populate picked quantity .how can i do it? how can pass picked quantity from ME21N to VL02N?

To be reward all helpfull answers.

Regards.

Jay