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?