You can find this option on the Sales offers, Sales orders and Sales lines forms. Its behavior is determined by a combination of some of the fields on these forms.

The General tab of the sales lines contains the Desired shipping date field. If the default icon  next to this field is not disabled, the field uses the desired shipping date specified on the General tab of the Sales offers or Sales orders form. If you change the desired shipping date on the sales offer or sales order, also the finish date on the sales line will change.

If the Finish date of linked production files is based on shipping date option is enabled, also the Finish date field on the General tab of the Production files form will change. This only happens if the following criteria have been met:

• The status of the sales line must allow planning. Otherwise, the field will not change, even if the option is enabled.
• The Finish date field on the Production files form must not be empty. If it is, the field will remain empty.

Also the settings on the sales order level, the settings on the sales line level, and the activation or deactivation of the default may collectively affect the behavior. The table below explains what happens when the different settings are used: