How to check the previous item value in a multirecord block

Oracle Version:10g
Forms Version:10g
Hi all,
Good morning to all,I have a multi-record block in a form where one of the items values is been selected from LOV.user can only select the value from LOV.
If once user selects the value from LOV and moves to the next record of multi-record and again selects the value from LOV,i should not allow users to select the previous value from the user so that duplication of records is avoided.
and important note is that i should achieve this before saving it into the database because once saved in the database i can compare the values and hide the previous value.
Any help will be appreciated.
Thanks and Regards

This is a common question in the forum! There are several different solutions. Take a look at the following articles. Both will perform the needed duplicate check.
Forms - Record Group Processing (Duplicate Value Checking...
or
Avoid duplicated records in a block
If neither of these solutions work for you, search the forum for other options.
Hope this helps,
Craig B-)
If someone's response is helpful or correct, please mark it accordingly.

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