Hi there Zoran82,

your best bet may be this workaround:

open a new assembly and place your part in it. Then you mate it with the planes and or origin as you need it. That way the part is exactly where you want it to be with regard to the SolidWorks origin which is what you are trying to achieve.

You can then save this as an assembly or a part whichever you think best.

I know this works because I have had the same problem a few times in the past and this is the fastest way I have found to sort out this problem.

Kind regards,

George.