Why can I not move project that is state: In Progress to the state: On Hold in Madrid?

[jbugarin]

In the instance that we use, I am trying to switch my progress from the state In Progress to On Hold. The error I am receving is this: "Updating project state from Work In Progress to Pending or Open is not allowed. Update all tasks state to Open to set project state to Open. " 

Is there a different way to get around this issue besides having to set all the task to open which resets all to 0 percent. 

Thanks

[Bob30]

So you are saying that if I have a project with 5 tasks and 2 of those tasks are complete but the others are in progress or on hold for whatever reason I cannot switch the project state to pending?