I must say I'm not very sure because I've never tried before a set analysis similar to the one you are trying to interpret.
From my point of view you are counting distinct values of Opportunity ID that respect the following conditions:
- Fiscal Year = 2011
- Partner Geo = AMER
- Program Name = ACE
- First-in = 1
- DateFlag = Submetted
- the amount of Sold Value SRP greater than 50000
To find out more information on set analysis, please see page 1252 of QlikView Reference Manual. You might see also details on aggr function at page 1251.
Hope it helps.