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creo8 config.pro option documentation for: AUTO_ERASE_SET_DATUM_PLANES            

auto_erase_set_datum_planes

Controls whether set datum planes are automatically erased in newly created drawing views.
no* - Automatically shows the set datum planes when a drawing view is placed.
yes - Automatically erases the set datum planes when a drawing view is placed.
*  
This configuration option is applicable only when you create a new view in an existing drawing or create a new drawing. It may not work for other workflows, such as replacing a model of a view or adding a new component to the assembly and its impact on the drawing view.
When the Drawing View dialog box is open, the set datums are displayed because you may need to select them as geometry references for the creation of a view. When you click OK , the Drawing View dialog box closes and the set datums are erased.