Change column order
Changing the order (IDX) of the columns in a table is considered a major change only when the table information can be requested externally (other elements, web API, Automation scripts, etc).
If the table is hidden (RTDisplay = false), it is not considered a major change.
Impact
A shift in IDX will result in incorrect parsing of the data when the table information is requested by external sources.
Note
When the column of type "displaykey" needs to be moved (for example to add new columns in front of it), then no major change is required (only when the display key column is already the last column IDX). The displaykey column is in this case only used to display the display key in Cube and should not cause issues.
Workarounds
There is no workaround.