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Creating a new field in the sale.order model

At the top of the form, you can see that the Model Description for the sale.order model is Quotation. For the purposes of this chapter, we will refer to the model, rather than the model description. Let's go ahead and start adding our custom fields to the sale.order model. Please be aware that it can be easy to accidentally click Create and create an entirely new model. We don't want a new model, but rather want to add fields to the existing model. Click Edit to edit the sale.order model, and then scroll down to the bottom of the field list and click Add a Line as shown in the following screenshot:

In the preceding example, we have specified our Date Required custom field.

The x_ prefix is already ...