I recognised that the pset and qto definitions have changed in version 4x3 (IFC4X3_TC1 and IFC4X3_ADD1). In the corresponding xml files with the pset/qto-definitions there are no IfdGuids and no Aliases (name and definition aliases) anymore.
Why is this so? No need of ifcguids and aliases anymore? Or is it an error in the generation of the xml files?