When a user tries to add data for two fields which were already selected in the previous new item, it should not allow the user to save, validation error should be thrown..
Sharepoint should check through the list and found for the possible combination. for example: product and price are two fields. User selected product value as "bat" and price as "100" and saved it. Then in a new form when user try to add same values for two fields it should not be aloowed to save. Can i solve using jquery
Actually it is a infopath form. Since these two fields were multiselection listbox and merge data during publishing. I am not able to retrieve data to a textbox to concat two field data and set it as unique column. unfortunately i cant do this due to this multiselectionlistbox.