System and method for reliable symmetric data synchronization

A method for adding a data item during a synchronization process between at least one sending (source) side electronic device having a database and at least one receiving (target) side electronic device having a database, the method comprising:

• receiving a data item at the at least one receiving (target) side electronic device from the at least one sending (source) side electronic device;
• assigning an identifier value to the data item stored in both databases, such that the local identifier of the data item stored in the database of the at least one sending (source) side electronic device is identical to a remote identifier of the same data item stored in the database of the at least one receiving (target) side electronic device;
• verifying that the data fields contained in the data item as stored in the database of the at least one sending (source) side electronic device match the data fields contained in the data item as stored in the database of the at least one receiving (target) side electronic device;
• after the data item is added to the database of the at least one receiving (target) side electronic device, enabling synchronization of the data item in the database of the at least one receiving (target) side electronic device upon receipt of the remote identifier or the local identifier of the data item from the at least one sending (source) side electronic device.