(Personalized Seal). An acknowledgment is one of the most common types of notarial acts, but it often confuses Notaries.Here are 5 steps to performing an acknowledgment. The Request for the Written Statement MUST be completed, notarized and sent to the Dallas. An acknowledgment copy will be returned to the filer, along with an acknowledgment letter, detailing what was indexed into the Filing Officer's indexing system. This letter serves as an acknowledgment of my participation in the City of Dallas Self-Certification Program. An Acknowledgment of Paternity (AOP) is a legal document that allows parents who aren't married to establish legal paternity. How do you fill out an acknowledgment letter?