Incorrect Ship to address in delivery.

Hi all,

In our company data was migrated from old system(V-4.7) to new system(ECC 6.0), here few open sales order also migrated. when open sales order migrating to new system at that time Sold to -A and Ship to- B but when subsequent delivery takes place Sold to and Ship to are same i.e "A". Can you explain why it is happen and how guide me how to resolve the.issue.

Please let me know that when we have the Different ship to parties, we should maintian the Ship to parties in Sold to patries ?

i.e we should maintian in sold to master dataI( sales area view > partner tab)