Dear Samar
I think there is a technical issue when you add new fields in this flow. As this is a standard expert routine it might not read the new fields and therefore leading to this problem.
You can try this by deleting the new fields and then doing the loading.
If you want to go with new fields then a complete z flow will have to be created.
You can refer the below 2 links for your reference
http://scn.sap.com/thread/1771461
http://scn.sap.com/thread/3319183
Regards
Gajesh
