Using Messages 
You can integrate query-related messages into your Visual Composer model. Messages are generated from an output port on the query, and provide information that is relevant to the query, such as whether the query has been successfully saved or if there has been a problem saving it.
Prerequisites
As outlined in Work with SAP BI Systems
There must be active messages associated with the query in order for them to be displayed in Visual Composer
NoteSome messages will only appear the first time they are issued if, for instance, they have to do with successfully generating a query, which is an activity that is not repeated (until the query definition is changed again).
End of the note.
Procedure
On the Find Data Services task panel, select a query or query view from a BI system and drag it to the workspace (see Using a BI System as a Data Service).
In the workspace, drag from query's Messages port and choose Add Table View from the context menu.
Result
A Messages Table is added to the model. The table lists any available messages in rows and displays for each message its type (for example, I for information or S for success), ID number, and text in three columns. Displayed in runtime in the portal, the table might look something like this:
More Information
Messages Table in the SAP NetWeaver Visual Composer Reference Guide.