Hi Manuel,
Did you get any help form that post? Or your requirement is different. Please advise with post reference you have reviewed.
FYI
Once posting is made in the cost center then you can not change it until you have closed that fiscal year and you are in new fiscal year.
Or you can open new cost center and repost the transactions being posted to the incorrect cost center. But this would not be easy as not only you will require resource for this special project but also planning, budgeting data would require the same treatment.
Thanks
Naseem