The present disclosure involves systems, software, and computer implemented methods for creating an extension field across system tenants in a customer landscape. One example method includes receiving a request to add an extension field to an entity used in a customer landscape. Entity-using system tenants that use the entity are determined. Event-pairing information is provided to each entity-using system tenant to enable receiving of extension field events. Field attribute values for a set of field attributes for the extension field are received. A field creation event is generated that instructs a system tenant receiving the field creation event to create a local field that has a target state of the extension field in that system tenant. The field creation event is sent to each entity-using system tenant.