[Image Source: ILR Validation Rules 2023-24 Version 4 Published 24/01/2024]
If a value has been entered in the "Outcome Grade" field (in the 'Start & End' tab of an ILR Learning Aim's summary); then that value must match one of the 'Attribute Codes' that are listed in the ILR Specification for "Outcome Grade".
Here is a link to "Outcome Grade", in the ILR Specification for 2023 to 2024:
https://guidance.submit-learner-data.service.gov.uk/23-24/ilr/entity/LearningDelivery/field/OutGrade
We most often find that the reason an OutGrade_01 error has been triggered, is because a user has recorded "PASS" in this field (which is not a valid 'Outcome Grade' code);
If you need to report that the grade was a "pass", then the code you must record in the aim's 'Outcome Grade' field is "PA".