while creating the purchasing order in 3rd party

sd guru's,

while creating the p.o.in 3rd party sales 'company code not assigned to country or country to calculation procedure' i have this error.

i assigned country to company code.

then i was trying to assign calculation procedure to country 'in' in t-code'obbg', but there is no calculation procedure for india.

how to define calculation procedure and assign.

plz..

thanks and regards.

raju.