MRP Workench - Why I see many Items in there even thought MPS contains only ONE item

Hello group,

I created a Forecast Set with only 1 Item in it, where I put a Forecast of quantiy 1 for 20-Jan-2014.

I then loaded my MDS from this Forecast Set, with that one item.

I then loaded the MPS, still with that one item.

Then I ran the MRP.

After the MRP has completed, I selected the MRP Workbench, click on Item Button, then click on Find.

I was expecting to only one Item, the Item I loaded in my MDS, MPS, MPR.

Why do I see so many Items in the MRP workbench, and how to remove them from there? See attached screen shot.