How to determine territory based on ship to party in Transaction

Hello Gurus,

Can any one help me how to determine territory based on ship to party (Genrally system will read attributes of sold to party). We tried to modify the code for last method of territory badi its working for ship to party but as per our scenario we need to read the attributes of ship to party which is selected in business transaction rather than from BP master data, the reason is there may be several ship to parties for one sold to partner.

If any one is having any solution please let me know.

Thanks & Regards,

Bharat.