RSO2 - > Generic Delta does not work

RSO2 --> Datasource A extracted from table B, and there are two time fields in table B :

BUDAT : Posting Date in the Document .

BLDAT : Document Date in Document.

For Generic Delta -> Delta-specific Field ,I choose "Time Stamp' and Field Nm "BUDAT".

For Setting , only choose "Addtive Delta."

But , when I create the Delta Package and start it , there is no Delta datas

How to solute it , Tks!