What I can see from the xpath is you’re trying to retrieve a VacationRequest entity querying its relation with the Submitter entity from the “VacationManagement” module and for the second xpath you’re trying to retrieve the same entity querying the Approver from the “VacationRequest” module.
You may have something like this in your project:
Module VacationManagement has the Submitter entity
Module VacationRequest has the Approver entity
And we can not tell where the module the VacationRequest entity is from. But I’d guess it’s also from the VacationRequest module.