Hi Monique93. I would suggest that you reverse the incorrect journals and then enter them correctly. Unfortunately they will show on the Customer statements but at least it will show as reversed.

I always suggest that you do a backup before you do your journal entries so that once you have made your correction you can check that it works as planned. If not, then you can restore your backup and redo it. Saves trying to correct incorrect "corrections" which start looking quite messy.