Editor help - Start lines

[PatG]

I am trying to adjust the player 1 start line for a user campaign.

First RTFM.Map Editing Hot Keys table says use the ! key.

I go into the map editor, click on one of the hexes in the "X" row where I want to set the start line then hit the ! key.

Save the map, save the scenario, go to the campaign editor, clear the scenario, reload the now modified scenario and - no change in deployment line.

Second attempt as above but hitting the ! key then selecting the row - no change.

Re-read the game guide - under Variable start lines find a reference to using the % key to change the start line - try steps above with % instead of ! - no change in start line.

At no time did I receive any dialog box or message saying the start line was changed.

So - what am I doing wrong?