How to Update a Cost Category That Is Tied to a Productivity Value

There is a specific way how to update a cost category that is tied to a Resource Group. If you tried to type in the Labor Cost field, then you are essentially overwriting the Cost and Productivity of that Line Item. 

In order to update the Labor Cost, then you have to edit the Total Labor Cost instead and that will back into the Labor Cost and keep the Productivity. 

Take a look at the explanation in the video.