- Description: After taking over the enemy territory the building of biplane in the aerodrome, which was just taken over, was not possible (see the picture and save file)

- Attachments: 1 save, screenshot 

- Steps to Reproduce: it was not tried, because the previous save is not available

- Expected Behavior: Building biplane should be possible, since all conditions were met. 

Save file: Bi-Plane not possible to build.ctr