Not able to get Document floe properly

Hi,

In VA02 screen when i enter the Sales Order number,and click document flow,i could the complete list of subsequent documents,

Sales Order->Delivery-->Transfer order.

In the VBFA table when i enter the Sales Document number in Preceding document filed,i could not get the To why is it so?

Is there any error in Configuration??

Please let me know,

Please find the screen shot.