For the most part, database integrity checks are built into the system and it should not be possible to put invalid data into the database. However in some cases, whether for reasons of complexity or for some other reason, some database integrity problems are not caught by the system. There are also questionable cases; situations where the acceptability of the data is dependent upon circumstances. In these cases it is useful for the system to provide a warning and allow the user to decide whether a problem really exists. For these reasons, Babase needs a warning system.

Beginning with Babase 5.7.5, Babase's warnings are managed by the PostgreSQL extension, "Isok". For details about how it works and how to use it, see its documentation.