selecting a record from ALV

Hi :

I have a custom tcode for which i am creating bdc program using call transaction.

the custom tcode is for creating process orders based on plant,shipping point and delivery date.

after the recording , when i execute the bdc program in mode 'A' , its woking fine, since im giving inputs in the selection screen and in the ALV list im selecting the record.

when i execute in mode 'N', it says " no records selected". BDC recording dint record any thing related to selecting that particular record from the ALV list.

How can i execute my program in mode 'N', in background and create Process orders.Since my ALV record contains only 1 record( because inputs in selection screen are sales order, plant and item) , how can i select that record in background from the ALV and create a process order uisng BDC call transaction.

Regards,

Raghu.