V_T5DWN is an SAP View so does not store data like a database table does but can be used to process "Generated Table for View" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this View. These can then be used to store and process the required data appropriately.
i.e. DATA: wa_V_T5DWN TYPE V_T5DWN .
Below is the documentation avaialable and full details of the fields which make up this View.
You can view further information about this via relevant transactions such as SE11 or SE80. Also check out the Comments section below to view or add related contributions and example screen shots.
Display/Maintenance via SM30:
Enhancement category i:
See here for more information about this and other SAP enhancement categories
SAP V_T5DWN View fields within data Dictionary