Thanks for your reply:
When I duplicate an item, the “make” and “manufacturing part number” are there (as I put them there earlier), and if I alter the categories in any way, this information disappears. This did not do this before for minor category changes, It only did this if I chose a “motorbike” instead of “car” category.
There is definitely a loss of information happening now, that did not happen before.
This increases my listing time quite a bit for every advert.
I really hope you can understand what I am talking about here, as it has definitely changed, for the worse, in my opinion.
If you can create an advert yourself in the car parts category, and fill in the required items in the item specifics field. Which is the make and part number (or similar- the fields have stars next yo them) and then save and exit, then duplicate the advert, then change the category slightly, you will see that all the item specifics will disappear.