Errors

TM_6795 The Repository service marked the session or session instance as impacted and the integration service is not configured to run impacted sessions.

Solution:   This is mainly because you have modified the mapping and directly running the session without refresh.    Mapping is nothing but the algorithm or steps of a task. So this steps are stored in the repository and session will take the steps from the repository. when you first time create or open the session it takes the steps from the repository into the memory.  If you refresh it will update the memory by taking the data from the repository again.The solution is to refresh the session and validate it.