Need a help on Screen entry

[Krishna Vivek]

Hi Folks

I am working on a screen and I really need your help.

Security Code: 755RY9901

Effective-Date                      Interest                    Valid
--------------------                       -----------                    ---------
June 28, 1999                            .333                       Y
June 30, 1999                            .332                       N
June 30, 1999                            .342                       Y

In this screen you can only enter data.  if the user is entered an incorrect interest, then he is allowed to enter the effective date again and enter the interest,  When a new  interest is entered for an existing effective date, the system would turn the first entry as invalid.

I have tried so many ways, but no luck yet.

Thank you all in advance.
Krishna

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