how to promote?

[ghostlight]

Longstreet's detail screen says he's promotable, but in the orders screen "promotion" is grayed out and the tool tip says he's not eligible. He's active, his division is in a stack by itself. If I detach him from his division and put him in his own stack it doesn't change anything. Am I missing something?

[Gray_Lensman]

deleted

[ghostlight]

much appreciated