diff --git a/models/workflow_execution/workflow_execution.go b/models/workflow_execution/workflow_execution.go
index 354f686..e273c2c 100755
--- a/models/workflow_execution/workflow_execution.go
+++ b/models/workflow_execution/workflow_execution.go
@@ -17,6 +17,17 @@ import (
 	"go.mongodb.org/mongo-driver/bson/primitive"
 )
 
+// BookingState tracks the reservation and completion status of a single booking
+// within a workflow execution.
+//   - IsBooked: true while the resource is actively reserved (set on WORKFLOW_STARTED_EVENT,
+//     cleared on WORKFLOW_STEP_DONE_EVENT / WORKFLOW_DONE_EVENT).
+//   - IsDone: true once the booking has been confirmed by the remote peer (CONSIDERS_EVENT)
+//     or completed (WORKFLOW_STEP_DONE_EVENT / WORKFLOW_DONE_EVENT).
+type BookingState struct {
+	IsBooked bool `json:"is_booked" bson:"is_booked"`
+	IsDone   bool `json:"is_done" bson:"is_done"`
+}
+
 /*
 * WorkflowExecution is a struct that represents a list of workflow executions
 * Warning: No user can write (del, post, put) a workflow execution, it is only used by the system
@@ -33,8 +44,8 @@ type WorkflowExecution struct {
 	State                enum.BookingStatus             `json:"state" bson:"state" default:"0"`                                               // TEMPORARY TODO DEFAULT 1 -> 0 State is the state of the workflow
 	WorkflowID           string                         `json:"workflow_id" bson:"workflow_id,omitempty"`                                     // WorkflowID is the ID of the workflow
 
-	BookingsState  map[string]bool `json:"bookings_state" bson:"bookings_state,omitempty"`   // WorkflowID is the ID of the workflow
-	PurchasesState map[string]bool `json:"purchases_state" bson:"purchases_state,omitempty"` // WorkflowID is the ID of the workflow
+	BookingsState  map[string]BookingState `json:"bookings_state" bson:"bookings_state,omitempty"`   // booking_id → reservation+completion status
+	PurchasesState map[string]bool         `json:"purchases_state" bson:"purchases_state,omitempty"` // purchase_id → confirmed
 
 	SelectedInstances    workflow.ConfigItem `json:"selected_instances"`
 	SelectedPartnerships workflow.ConfigItem `json:"selected_partnerships"`
@@ -189,9 +200,9 @@ func (d *WorkflowExecution) Book(executionsID string, wfID string, priceds map[t
 	booking = append(booking, d.bookEach(executionsID, wfID, tools.DATA_RESOURCE, priceds[tools.DATA_RESOURCE])...)
 	for _, p := range booking {
 		if d.BookingsState == nil {
-			d.BookingsState = map[string]bool{}
+			d.BookingsState = map[string]BookingState{}
 		}
-		d.BookingsState[p.GetID()] = false
+		d.BookingsState[p.GetID()] = BookingState{}
 	}
 	return booking
 }