ESMA have today published a template which should be used for the communication of errors and omissions to them (see the final tabs of the validations documents here). ESMA have provided the following population guidelines for how to write an error and omission form;
General
All fields are mandatory is relevant & available on notification date.
Each data quality issue requires a separate notification
If several data quality issues with a common cause a single notification can be sent.
All notification should use standardized filename (see DQ notification template).
If the Entity responsible for reporting is responsible for multiple counterparties, all counterparties with significant issues should be included.