Why does the episode show @@ on PPS Tracking?

The @@ OASIS DocID is related to the NOA (Notice of Admission) process. NOA is a one-time submission that will establish the care for the patient until discharged from the agency. 
Use these troubleshooting tips if you are not sure why the PPS episode is showing up as DocID = @@ or unexpected HIPPS error. 

Does the OASIS that is tied to the episode have a HIPPs code and exported (SOC or Recert)?