data have;
length CustomerID AccountNo $12;
infile datalines missover;
input CustomerID AccountNo PrincipleLoss InterestLoss CreditBalance;
datalines;
12459699 1234567890 200 100 1000
12459699 3154645488 400 250
12459699 5074723086 500 300
12459699 6994800684 750 800
12459699 8914878282 120 40
13562246 1234557890 454 210 2000
13562246 1234567890 454 455
65646546 1234577890 44 212 1500
65646546 1234587890 21 113
;
run;
data want;
set have;
by CustomerID;
retain balance;
if first.CustomerID then balance=CreditBalance;
CreditBalance=max(0,balance);
balance=balance-PrincipleLoss;
Recovery1=ifn(balance gt 0,PrincipleLoss,max(0,balance+PrincipleLoss));
balance=balance-InterestLoss;
Recovery2=ifn(balance gt 0,InterestLoss,max(0,balance+InterestLoss));
balance=max(0,balance);
run;
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