@ChrisCranford Nope, I´m recreating the DB with this config many times a day. There are no null values at the audit entries. An example of an audited CitaAgenda is:

id | rev | revtype | reconocimiento_id
--------------------------------------------------
1 | 1 | 1 | 9

So I am audting only the Id field of Reconocimiento (reconocimiento_id). The other fields (the ones that I´m finding to be null) are not present in the audited entity table.