It would be particularly handy if their was an "Ignore all Unmatched Sources Items" button on the Line Items/Lists Tab during an import. When you have a rather large source module and you are only wanting to import a small proportion of that source file, rather than having to select ignore for every Source Items, simply match the ones you require and then press this button to set the rest to Ignore. Would work perfectly with the current "Clear All" button and would remove warning errors for those who just leave them blank during mapping because it takes to long to individually select ignore.
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