how to deal with BP inconsistencies in SRM?

Dear Experts,

How to deal with Business Partner inconsistency in SRM?

A BP is damaged beyond repair?

Should we delete the BP of the user (SU01 user)? Are we allowed to delete a BP? or do we need to archive the BP?

What will happen to the follow-on documents of the particular BP?

Should we close all the transactional documents or we should simply the change the BP of the documents manaully?

Please, share your expereince.

Thanks and regards,

Ranjan