Delta Init from DSO to cube different from Full load...

Dear Gurus,

I am stuck with a behaviour I have never seen. I have a DSO that loads a cube.

When I run the delta init DTP for the first time, I get only 500K records extracted among the 1,2 million I have in the DSO. If I decide to run the Full DTP to check, and if I run it, I get the 1.2 million records.

My first run is set to take the active data, not the change log

Does anyone have a clue on that ? I might be missing something very simple, but may too simple ;-)

We are on BW 7.3 SP 5 on top of MSSQL DB

Thanks

PY