Wrong Updation of BP telephone details from ECC to CRM

Hello Experts,

We are facing an issue.

The BP data has been replicated from ECC to CRM system. We find that the telephone details are not updated correctly. In CRM, it does not delete the existing numbers for updation, but adds an entry there. It does not sets the new entry as default, whereas the earlier entry remains there.

Regards,

Kanika