Can we change Data model of an existing Knowledge model?

Hello, No, you generally cannot directly change the underlying Data Model of an existing Knowledge Model in Celonis. The "Data model fail" notification likely indicates that the Knowledge Model's existing PQL formulas or record mappings are incompatible with the new Data Model, causing errors. You would typically need to create a new Knowledge Model associated with your desired Data Model and re-configure your KPIs there. Thanks, let me know if this helps!