Use Workspace Runner.

Create a workspace that will be ran depending on the value of a PARAMETER that the Runner workspace sends via attribute to the WorkspaceRunner.

Use Tester instead of AttributeFIlter with Right Value set to that parameter.

You can use StatisticsCalculator to get a single feature from the dataset in the Runner workspace (or Sampler with GroupBy set). OR, if your dataset allows it, use a WHERE clause in the reader (on the to run side) set to PARAMETER.

On the left the Runner and on the right the workspace to Run. Notice that the Test is done on the same attribute.

i understand, but i'm using FME 2016 build 16494, it doesn't have the same features as the 2021 version

Do you have any solution on FME 2016 ?

In the workspace to be ran create a User Parameter that will be used to pass the attribute value through WorkspaceRunner.Save the workspace, delete WorkspaceRunner reinsert it and you will have the option to set the value to an attribute

I have done it, many thanks bro ! 😁

Do you have any other solution without using WorkspaceRunner, by the way ?