FULL load issue when DSO1 to DSO2

Hello

I got the issue after Full load data .

DSO1 ---> DSO2  ,  DTP is FULL load

I find the all the fields in DSO2 is empty( except Key) , but there are the values in DSO1.

e.g.

DSO1,

A0001     EMEA        SDKD        12.55

DSO2,

A0001     (empty)     (empty)     (empty)

I checked the change log in DSO2, there are two records,

recordmode R , all fields have the value,

recordmode N , all fields is empty.

so the active table of DSO2 is empty.

why the issue happen? and how？

Help me! Thank you!