creo6 config.pro option documentation for: ALLOW_DUPLICATE_VIEW_NAMES 
allow_duplicate_view_names
Controls the renaming of drawing views.
Default and Available Settings:
no* - Does not allow you to use the name of an existing drawing view for another views in a drawing.
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You can click Insert
> Import Drawing/Data
and import a drawing with duplicate names. However, a warning appears after you click Review
> Update Draft
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yes - Allows you to use the name of an existing drawing view for another views in a drawing.