problem in creation of STO(stock transport order)

hi all SAP gurus,

i am facing the problem in creation of stock transport order with ME21N code. i m getting the error msg of "Not possible to determine shipping data for material in STO "

i have checked the stock transport order setup in customization. but not getting the clear idea to come out from this problem.

if anybody have the idea of " how to do the customization of stock transport order setup, pls. let me explain.

thnx in advance.

rgrds,

rajesh