Rules optionally can have a source field, which is a one word free form text, indicating where the rule is coming from. User specified/configured rules -should leave this field empty. Rules imported from the schematics (or netlist) -should set this field to sch. When present, the GUI will display rules from +should leave this field empty. Rules imported from the netlist (or schematics) +should set this field to netlist. When present, the GUI will display rules from the same source groupped. But the real purpose of the source field is to make re-import of rules possible: when a new import from the same source is performed, the import code should remove all rules coming from the source and create