When warranty reports are in progress, they are displayed in a dedicated widget on the home page:

You can directly access a report under warranty by clicking on the desired line.

You can also access the list of warranty reports by clicking on the icon on the "Repair" icon, then on "Warranty Reports":

The list of warranty reports is displayed in the workspace: 

Double-click on the line corresponding to the warranty report you want to update:

This report is "invalid".

The categories in red are those containing anomalies or missing information.

Click on the arrow to open a category, the fields to be corrected are highlighted in red, the error is indicated on the left.

When you have finished editing, do not forget to save by clicking on the "Save" function in the banner.