In Microsoft Dynamics NAV 2016, a report has a built-in report layout by default; it can be a Word report layout, a Standard RDLC report layout, or both. You can update custom report layouts with the help of upgrade codeunits. It handles all the changes in the report datasets that affect the report layouts. Upgrade codeunits enable you to programmatically update multiple custom report layouts in the database to changes in report datasets, which cannot be resolved by users from the Microsoft Dynamics NAV client; however, there are certain changes to the dataset that the user is required to modify manually in the report layouts before they can be used. These types of change include, for example, deleted fields or field name conflicts as a result of renaming. Upgrade codeunits enable you to handle these breaking changes to report datasets and layouts without requiring end user interaction.

To design the report upgrade logic in an upgrade...