diff --git a/models/booking/booking.go b/models/booking/booking.go
index 14a0a52..4d6b20a 100644
--- a/models/booking/booking.go
+++ b/models/booking/booking.go
@@ -15,7 +15,7 @@ import (
  */
 type Booking struct {
 	utils.AbstractObject                    // AbstractObject contains the basic fields of an object (id, name)
-	ExecutionsID         string             `json:"executions_id,omitempty" bson:"executions_id,omitempty"` // ExecutionsID is the ID of the executions
+	ExecutionsID         string             `json:"executions_id,omitempty" bson:"executions_id,omitempty" validate:"required"` // ExecutionsID is the ID of the executions
 	DestPeerID           string             `json:"dest_peer_id,omitempty"`                                 // DestPeerID is the ID of the destination peer
 	WorkflowID           string             `json:"workflow_id,omitempty" bson:"workflow_id,omitempty"`     // WorkflowID is the ID of the workflow
 	ExecutionID          string             `json:"execution_id,omitempty" bson:"execution_id,omitempty" validate:"required"`