http://dcx.sap.com/index.html#sa160/en/mlserver/modify-ldts-connection-ml-scriptsref.html
http://dcx.sap.com/index.html#sa160/en/mlserver/ml-synchtech-s-3939388.html
The very first synchronization sends all data because the remote database has a last download timestamp of 1900-01-01 00:00:00.000
There is not a single solution to work around this but you could create a modify_last_download_timestamp event in the consolidated database. More details in the links above.