When you want to weave double width, you will need to create a quality with the correct weave structure.
Instructions to create a quality can be found in Create a Machine Quality.

Make sure you select a weave structure that can be used for double width:

Name

You can recognize the weave structure by the "," in its name.
The name is the combination from the name of the bottom weave structure and the name of the top weave structure.

How does it work

When you use the quality for double width in a production order, the bottom carpet will be processed with the bottom weave structure (for example 4P_SL014B) and the top will be processed with the top weave structure (for example 4P_SL014T). 

For background (background rest, background free, ... ), the weave structure for the background will be used.

Instructions to create a double width production order can be found in Create a double width production order.