I'm working with Flat Pattern drawings for some sheet metal parts in SW2016, SP3. Whenever I add a dimension, an "Over Defined" warning pops up. Some dimensions can be edited and changed "driven". This option is not available for other dimensions, such as the overall size of the flat panel. I didn't have this problem in SW2015 and was able to add dimensions without ever seeing the "Over Defined" warning. What's the solution?