Not possible to determine shipping data for material 100100051

hi friends,

Good Morning,

while doing stock transport purchase order through ME21N

the followings errors are occured:

Not possible to determine shipping data for material 100100051

Message no. 06280

and the second one is

Customer 101020 does not exist (please change entry in plant IBM3)

Message no. 06849

please suggest me how to resolve this issues

points will be awarded for good answer.

Thanks & Regards,

Swathi