Question

It is not possible to set the CanEdit-Property of " IphDataEntity_SchemaTime" to False. It is always True and therefore the Schematime can be moved every time?

Answer

If you implement this event IphSchemaX3.OnBeforeCanEditSchemaTime that is fired just before the edit starts on SchemaTime, you can set CanEdit=false on the SchemaTime in the argument, and stop editing.