Until a few days ago, I didn't experience any issues extracting Deals using the following code:

criteria = "SCREEN(U(IN(DEALS)/*UNV:DEALSMNA*/), \
            BETWEEN(TR.MnAAnnDate,19900101,20001231)/*dt:Date*/, \
            IN(TR.MnAStatus,""C""), \
            TR.MnADealValue(Scale=6,IncludeNull=False)>=1, \
            IN(TR.MnAFormType,""A"",""AA"",""AC"",""AM"",""AR"",""M""), CURN=USD)"

display = ["TR.MnASDCDealNumber",
           "TR.MnAAnnDate",
           "TR.MnAAcquiror",
           "TR.MnATarget",
           "TR.MnAAcquirorNation",
           "TR.MnATargetNation",
           "TR.MnADealValue", 
           "TR.MnAAcquirorPublicStatus",
           "TR.MnATargetPublicStatus",
           "TR.MnAStatus",
           "TR.MnAPctOfSharesOwnedPostMerger",
           "TR.MnAFormType"
          ] 
Deals1990_2000, er =ek.get_data(criteria,display)

However, since then running the code results in the following output (which is obviously not correct):

The issue can be solved if I remove the "TR.MnAFormType" parameter in the display list. I checked the data item browser and it seems that this is the correct parameter.