Thanks for your help guys. I was refering to the variables the wrong way. 
This worked for me:

idx <- !duplicated(detail2[,c("TDATE","FIRM","CM","BRANCH", 
                     "BEGTIME", "ENDTIME","OTYPE","OCOND", 
                     "ACCTYP","OSIDE","SHARES","STOCKS", 
                     "STKFUL")])
detail3 <- detail2[idx,]





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