If you use the supplement MONITOR Electronic Invoice Management (EIM) you can use this button to open a dialog box where you can select one of the following tasks as well as see the invoice image:
The setting Automatic connection in Register Supplier Invoice is usually activated under Electronic Invoice Management under the Purchase tab in the Settings procedure. Then you do not have to use the EIM button but the dialog box will open automatically for the user. The permissions to the different tasks are configured for each user under the EIM button in the Users procedure.
Read more about settings for EIM, work flow and functions in the invoice image under MONITOR Electronic Invoice Management in the Using MONITOR Procedures guide.