Thx for the quick response. First of all the technical hints helped tremendously cause I’m a noob for wp and therefore ….
and second thx for pointing out that there might be some conflicts when I need to decide which field to take into account.
and last but not least I recognize that in the category view the additional field will be displayed – but at the very ending – after some time. I’m aware that there is the field but, e.g. pressing on the button ‘update’ in categories the content is displayed quickly and the fields after approx 5-10 sec later. I would assume they are missing – if I don’t know better….
anyway thx for your awesome help.