Allow user to select each item in list item only once.

Question

Hi,
What is the best way to go to stop the user selecting the same item in a list item more than one.
I have a multi record block, the user can select values 1-10 for each record, but they should not be allowed to select duplicates.
Thanks for any help!

Answer 1

Hi,
Suppose you have 4 list items A,B,C,D in block "test" and same 4 values in each list item. Now you want that, no two values selected by user in list item should be same.
On when-validate-item of list item B write code like :
If :test.A is null then
Message('First A must be enter");
Raise form_trigger_failure;
end if;
If :test.B = :test.A then
Message('value already in list item A');
Raise form_trigger_failure;
end if;
Now, for C same code with a addition of condition for B with OR operator like:
If :test.C = :test.A or then :test.C = :test.B
Like that.... you can achive your functionality.
But one restriction is that user has to enter values in list item in a pre-defined order only....
Hope that it would work for you.....