Delta Initialization problem with payroll extractor 0HR_PY_1

Hi,

Delta Initialization for payroll extractor ( 0HR_PY_1 ) is not extracting all the data ( extracting only 7600 out of 10600 ).

If i ran full update all 10600 records are extracting.

I am not using any selection for payroll data.

After delta initialization delta update also not picking any data even some latest data available in R/3.

Any expert ideas for this problem.

Any body experienced with payroll extractor any precautions for delta initialization.

Thanks in advance.