PLT_PreventEditGeometryOnTemlateInstances_BU makes sure that plot features that have been created using a plot template cannot be modified. That means, the plot cannot be modified in a way that it differs from its template.
The feature rule is applied when you modify the geometry, or the orientation of a plot feature.
The feature rule applies to plot feature classes such as PLT_PLOT_IMAGE, PLT_PLOT_LEGEND, PLT_PLOT_NA, PLT_PLOT_SCALEBAR, PLT_PLOT_DECORATION, PLT_PLOT_MAP.
Optionally, the feature rule parameters specify the feature classes that are checked. Each pair of parameters specifies a parent table name, and a child attribute name. Use the parameters to improve performance. See also PLT_PreventInsertOnTemlateInstances_BI.