Help needed with Korn Shell scripting

We receve pipe delimited file with
transaction ID,tran_date,Quest_cd,Ans_cd,ans_value.
Same transaction ID can be repeated with different quest_cd and ans_cd.

Basically I need to check if a perticular pair of quest_cd and ans_cd (say Q1234,A1234) is present under a transaction ,then another pair of quest_cd and ans_cd (say Q5678,A5678) should also be present.

Otherwise I need to remove the isolated row from input file and write to a bad file which should have the complete row in defect and with a comment that Q1234A1234 present but Q5678A5678 not present Or vice versa.
I am giving few lines of my file:
991320070521330000000003|Q13251|A18741|234567890123456
671320070521330000000003|Q13251|A18741|456787654328977
671320070521330000000003|Q13260|A18765|4567890987654321234
471320070521330000000003|Q13260|A18765|2345678901234561

In the above the two lines with transaction ID 671320070521330000000003 should be written to a good file as they are having both pairs of Q/A and the other should be written to bad file with comments like below:

991320070521330000000003|Q13251|A18741|234567890123456 --> ONLY Driver's Licence is present Credit card number missing
471320070521330000000003|Q13260|A18765|2345678901234561 --> ONLY Credit card number is present Driver's Licence missing
The reason why the two lines with transaction id 671320070521330000000003 should be written to a good file is that they are having both the Q/A pairs ie.Q13251|A18741 and Q13260|A18765 while the other transactions are having either of these pairs but not both the pairs

Thanks
Sri

For examples have only 4 fields even though you say there are 5 fields i.e

transaction ID
tran_date
Quest_cd
Ans_cd
ans_value

Humm, this could be a nightmare to run unless the file
is sorted. I would sort the file on the transaction ID, then
read in the file a line at a time, save line to temporary variables
read next line it, compare with temporary variables and do the
necessary depending on whether you get a match or not.

Hi
It is my mistake .Transaction date was not there in the example.You can treat this as 4 fields. The file is already sorted.I need the code to the action you suggested as I am new to UNIX and it looks complicated for me.
I hope you can help me
Thanks
SRi