Hello Jim,
You need to have an append structure in the Structure RIHAUFK_LIST, in a similar way explained in Step4 of the is document IWO10018: User Fields in Maintenance Order
Just now I appended one of your fields T001W-NAME1 and it is appearing like below in IW38. But what values you are expecting under this field/s you know better and you need to manage.
KJogeswaraRao