According to CALPADS, A student course section record was submitted for an SSID that was not enrolled on Census Day
If the student was enrolled in the LEA on Census Day but CALPADS does not show this Census Day enrollment, update enrollment in CALPADS. If student was not enrolled in the LEA on Census Day, remove the student course section record.
NOTE: Resolve CERT errors after the enrollment updates (SENR, SINF, SELA and SPRG) files have been posted with few to no errors. Most CERT errors are caused by file extracts that have not yet been posted error-free or from data that has not been correctly populated in Aeries.