DIXF template in ax 2012 r3

Hi,

I am using DIXF template to import the data in AX. There is wired behavior or have I missed something for the same when creating a new field in the table for the DIXF template.

3 custom field has been added to "ReqitemTable" named as Minimum, Maximum and Display quantity.

The Entity name is "Item coverage"

and Entity is "ReqItemTable"

When I have to create a new record it works fine and uploads the data, but when I need to update an existing data there is something wrong.

Can someone let me know how this be corrected..