LSMW - Display Converted data does not show Field Text

Hi,

I was doing LSMW to upload data using IW21 against Reference Notifications.

We have added fields under the User Status head in IW21 as per screen shot below:

the fields Equipment Hand Over and Equipment Take back Time fields above are custom fields i.e Z fields showing data values also.

During the step Field Mapping and Conversion Rules it shows all the fields and especially the above two fields as ZZEHT and ZZETBT but not showing their Field names below in front of the yellow pencil icon:

When i made the excel file it shows something like this

Again in above screen Field names of both fields are missing.

In display Conversion data it shows something like this

Once i have completed all steps and new Notification is generated without errors, the data from these two fields are not copied and shows blank.

This is my main concern, any ideas?

Thanks

Faisal