Hi MGS,
Although you didn't replied to my queries, whenever you change address manually in a document in ECC, in this case quotation. it generates a new address which is different from master data address and it tagges it as manual change in table VBPA.
Now GTS treats a manual changed address differently.
Please look into these lines, you should get a solution.
Appreciate if you could share your findings for the benefit of all.
Thanks,
Kul Vaibhav