Since there's a foreign key relationship between the selected row in the first table and the data in the parameter table (used for your trend graph), you can use a Parameter table filter to bridge this gap (see docs).

Here's how to do it:

1. Enable Advanced Settings
   Add ?showAdvancedSettings=true (or &showAdvancedSettings=true if other parameters are already present) to your app URL to expose the parameter table filters UI.
2. Create a Parameter Table Filter
   • Go to Parameter table filter sections
   • Create a filter and give it a name
   • Use the foreign key from the selected row in the first table as a filter condition.
     • For example, if the first table has a column name and the parameter table has a FK to this first table, your filter might look like:VALUE=FK == [FEED."Current view"."Table 1"."Selected rows".Tables.Name]

     • Use the intellisense to assist with the correct syntax and available variables.
3. Apply the Filter to the Trend Chart
   • Add the protocol parameter to the trend chart as data
   • Add an element to it (and apply it as a filter)
   • Add the parameter table filter as a filter