Error Message
After creating the mapping correctly using the datasheet definer, when the data list is generated, the data list contains grey columns and displays the error message:
"This cell is not editable because the object it represents has not been created yet."
Solution
You must ensure that you do the mapping correctly. This error message is encountered when you do not configure the mapping in the required format. It is important to map left to right exactly (or top to bottom, depending on your configuration) and in a continuous line. Check your existing mapping for any errors, and redo the mapping in the correct format.