Hi Jannes,
Is this concerning a 1-1 association? if you change the associated object in an object event, or when associated objects are being ‘autocommitted’.
About what you want: You can check the object from BD (Split), against the one you have as a parameter. If it has changed, you create a log-item, merge, and move on to the next attribute you'd like to check.
Hope this helps you.
KR
Mark