I submitted version 1.11 of the Shopping List app to Apple today which fixed a bug where barcode data was getting copied incorrectly. This was causing a number of strange errors:
1) Multiple items for same barcode name being listed, some with (null) letter Key.
2) Not being able to manually enter prices for scanned barcodes.
Once the new version passes review, it should be available in about a week in the app store.
Jim