---Requirements---
1. create a new empty mission and place a unit inside
2. add the given script to the init line (check description)
3. Preview it
---To Reproduce---
1. Start moving forward (and keep pressing your specific key for it)
2. when moving again, press your key for getting into the erected stance (ArmA 2 was default C)
3. wait until youre prone again
4. try to get into the erected stance again (will not be possible)