Hi Rana,
By adding append field your extract str will change, so it will effect delta pointer.
You need to lock base tables (0scem_1) of this data source.
You need to clear SMQ1/RSA7, by running tw times of delta info pack and move further. Cross check records count at RSA7, total column.
Delete init at bw side. move the transport request from Ecc dev to ecc prod and BW dev to bw prod(active verison of data souce), mapping transforamtions, added infoobject all stuf.
Once it moved prod, reinit your delta, unlock ecc lock on base tables for data source. after some time you can check reocrds count at RSA7.
If your seting delta setting for data souce 0scem_1, those also need re frame.
at dso and cube level also you need reinit delta. becuase by adding new object all str chnages were happen.
Thanks