Getting Error while adding sub project, Error: PRJXXXXXXX can not be the New Parent to Issue Unable to add SubProject to a Project. Error Message "PRJTASKxxxxxx can not be the New Parent to xxxxxxx"ResolutionPotential Cause: - There is an external dependency in any of the tasks present in the sub project, then we are not allowing to add one project as a subproject to another. We can verify this in planning console represents in dotted line. If that external dependency is removed then it is working as expected. For more info:External dependency Add an external dependency on planning console - Perform the project diagnostics and check if there are any project tasks missing the planned/actual dates For closed tasks, should have all planned/actual dates set. - Within the intended sub-projects there is a project task with a start date before its parent's start date. Identify if there are sub-projects with incorrect dates. If found, ensure they fall within the parent's start and end dates.