Note: If you customize the line style and arrows of a link
                        symbol (such as a PDM reference), your styles will override those selected
                        in the Display Preferences dialog, and may cause confusion and inconsistency
                        in the model. To ensure coherence in a model governed by a notation, select
                            Notation for the Style and Arrows properties on the Line
                            Style tab.
                     For more information on the Symbol Format dialog (including
                        the custom symbol options that let you control the default format options
                        for the symbol, and whether users can edit them, on a per-tab basis) see
                            Core Features Guide > Modeling with PowerDesigner > Diagrams, Matrices, and Symbols > Symbols > Symbol Format Properties.