I received the following error when trying to optimize
I don't have a constraint named "Product Mix." Instead Product Mix is a line item referenced in a constraint line item. The Product Mix references the variable line item directly so that shouldn't be an issue.
this is the constraint formula that i think is not working but the action error won't specifically state that.
The solution seemed to be by placing the Product Mix line item in the optimizer action as a second variable like some of you said. I didn't think to do that as I assumed only input (non formula) line items could be placed as variables to give the process flexibility to alter the variable values. But it makes sense that if the second variable references an input line item.