The multiple update behavior uses hidden form elements in the repeat region, those hidden form elements contain the ID numbers of the records to update. without submitting the form, it has no way to know which records you want to update.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.