Fastload -- doubt.. help required

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Fastload -- doubt.. help required

ouput report :

A Total Records Read = 35000
B Total ErrorTable 1 = 1250 (Not loaded due to error)
C Total ErrorTable 2 = 30 (Duplicate UPIs only)
D Total Inserts Applied = 33700
E Total Duplicate Rows = 20

i am confused with "duplicate rows" and "error table 2 rows"
according to what i understand :

"error table 2 rows" : 15 records which have dups in UPI so pairs make it 30

"duplicate rows" : after checkpoint and before the point where error reached its limit ..

can anyone please help me clear this doubt ?

Thanks
zilch