I am able to register add to cart form from "Product display" node view page.When two column layout is selected in manage build section and fields are arranged in left and right block including "add to cart" button.While saving following message is shown

Notice: Undefined index: weight in field_ui_field_overview_form_submit() (line 790 of C:\server\www\drup_2html_7.21\modules\field_ui\field_ui.admin.inc).

When add to cart form is viewed only add to cart button is placed in right place.

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