I am currently working as an intern, creating a dashboard for the Procurement department. There was already an existing dashboard, but it was incomplete. I am now trying to add more information to the data source, but I have been unsuccessful so far. Specifically, I am attempting to add the table "ln_whnwd210" to the source. This table shows items categorized as A, B, or C. However, I am currently unable to establish relationships with the existing source. Do you have any suggestions?