I am trying to make a design table for an assembly. I have everything dimensioned. I created a design table the way it says in the tutorial and added all of my parameters. I then tried to create functions and relationships within the table based on the differences between actual design and the way sales will call out dimensions. In order to do this I inserted several columns before the parameters where sales could type their numbers and where the parameters were I added equations linked to the sales numbers. For some reason I keep getting errors. One error was regarding the heading not being a valid name. I tried all different names, nothing seemed to work. I deleted the name and it still won't create the instance. What do I do?