Can't drag bent leader up or down

[cbt990]

Can't move AVERAGE GRADE level up or down. 

[barthbradley]

 Can you drag Level Line? 

You need to unlock first. 

...wait a minute. Are you meaning the elbow? Drag the dot at the elbow. 

...if you mean you can't move the Level after unlocking, Reveal Hidden Constrains. Maybe you have another.  

[ToanDN]