Hello,

The current Dual Write - GAB solution from Microsoft for Dynamics 365 Sales causes a problem in the out of the box MERGE functionality on Accounts and Contacts.

After installing the necesarry solutions from microsoft, when trying to merge 2 contacts or 2 accounts you will get a strange selection on the bottom of the fields: Electronic Addresses.

This is not an existing field and actually references to the PartyId. Switching this field in anyway in the MERGE will break the account or contact, making it unusable in other processes.