De or het orderafhandeling?

The correct Dutch article is:

de orderafhandeling

Rule Words ending in -ing: almost always de. See the rule

How to use orderafhandeling

the orderafhandelingde orderafhandeling
this orderafhandelingdeze orderafhandeling
that orderafhandelingdie orderafhandeling
our orderafhandelingonze orderafhandeling
your orderafhandelingjouw orderafhandeling
every orderafhandelingelke orderafhandeling
which orderafhandeling?welke orderafhandeling?
a big orderafhandeling / the big orderafhandelingeen grote orderafhandeling, de grote orderafhandeling