Create the column element for table column & first

What causes this issue?

You are editing the column elements of a table control and want to make
entries for a column width or header for a column element, but the
column element and thus the column itself does not yet exist.

System Response

The system rejects the entries.

How to fix this error?

First create the column element, for example with
- "Create element" or
- Assign the column element a name and "Refresh" or "Attributes".

Error message extract from SAP system. Copyright SAP SE.