Here's the blurb from the 'Star Wars Aficionado - Making of SW 2004/5 & 2007 update' segment on the subject: (nothing definitive)
April (EXACT DATES UNKNOWN)
LARS HOMESTEAD - KITCHEN INTERIOR
One day was spent filming the scene of Shelagh Fraser as Beru talking to Own in their Kitchen, and an additional scene, later cut from the final theatrical cut, of Beru using a milk dispenser. Fraser's voice would be dubbed for the film's release by an unknown actress (who would then be re-dubbed herself, for unknown reasons, for the STAR WARS TV version in 1982, before having her voice returned for the 1997 SPECIAL EDITION re-release).
http://www.starwarsaficionado.com/backissuepdfcatalog.html
http://starwarsaficionado.blogspot.com/