Full load from a DSO to a cube processes less records than available in DSO

Question

We have a scenario, where every Sunday I have to make a full load from a DSO with OnHand Stock information to a cube, where I register on material and stoer level a counter if there is stock available.
The DTP has no filters at all and has a semantic group on 0MATERIAL and 0PLANT.
The key in the DSO is:
0MATERIAL
0PLANT
0STOCKTYPE
0STOR_LOC
0BOM
of which only 0MATERIAL, 0PLANT and 0STORE_LOC are later used in the transformation.
As we had a growing number of records, we decided to delete in the START routine all records, where the inventory is not GT zero, thus eliminating zero and negative inventory records.
Now comes the funny part of the story:
Prior to these changes I would [in a test system, just copied from PROD] read some 33 million of records and write out the same amount of records. Of course, after the change we expected to write out less. To my total surprise I was reading now however 45 million of records with the same unchanged DTP, and writing out the expected less records.
When checking the number of records in the DSO I found the 45 million, but cannot explain why in the loads before we only retrieved some 33 millions from the same unchanged amount of records.
When checking in PROD - same result: we have some 45 million records in the DSO, but when we do the full load from the DSO to the cube the DTP only processes some 33 millions.
What am I missing - is there a compression going on? Why would the amount of records in a DSO differ from the amount of records processed in the DataPackgages when I am making a FULL load without any filter restrictions and only a semantic grouping in place for parts of the DSO key?
ANY idea, thought is appreciated.

Answer 1

Thanks Gaurav.
I did check if there were more/any loads doen inbetween - there were none in the test system.  As I mentioned that it was a new copy from PROD to TEST, I compared the number of entries in the DSO and that seems to be a match between TEST and PROD, ok a some more in PROD but they can be accounted for. In test I loaded the day before the changes were imported to have a comparison, and between that load and the one ofter the changes were imported nothing in the DSO was changed.
Both DTPs in TEST and PW2 load from actived DSO [without archive]. The DTPs were not changed in quite a while - so I ruled that one out. Same with activation of data in the DSO - this DSO get's loaded and activated in PROD daily via process chain and we load daily deltas into the cube in question. Only on Sundays, for the begin of the new week/fiscal period, we need to make a full load to capture all materials per site with inventory. The deltas loaded during the week are less than 1 million, but the difference between the number of records in the DSO and the amount processed in the DataPackages is more than 10 millions per full load even in PROD.
I really appreciated the knowledgable answer, I just wished you would pointed out something that I missed out on.