Add Z Email Field to Communication of BP

Hello Experts,

I have created a zfield for  secondary email address on the account page. The user requires this email address to be added to the table of email addresses in the BP Master

I have tried FM 'BUPA_ADDRESS_ADD', which adds an additional address altogether, and FM ' BAPI_BUPA_ADDRESS_CHANGE', which replaces the primary email address. Neither of the outcomes is acceptable. I need the secondary email address to be added with ID 002 in the communication tab. All advise will be much appreciated.