delta records are not loading from DSO to info cube

My query is about delta loading from DSO to info cube. (Filter used in selection)

Delta records are not loading from DSO to Info cube. I have tried all options available in DTP but no luck.

1. Selected "Change log" and "Get one request only" and run the DTP, but 0 records got updated in info cube
2. Selected "Change log" and "Get all new data request by request", but again 0 records got updated
3. Selected "Change log" and "Only get the delta once", in that case all delta records loaded to info cube as it was in DSO and  gave error message "Lock Table Overflow" .

When I run full load using same filter, data is loading from DSO to info cube.

Can anyone please help me on this to get delta records from DSO to info cube?

Thanks,

Shamma