diff --git a/models/workflow_execution/workflow_execution.go b/models/workflow_execution/workflow_execution.go
index f95236b..eb5e944 100644
--- a/models/workflow_execution/workflow_execution.go
+++ b/models/workflow_execution/workflow_execution.go
@@ -20,12 +20,13 @@ import (
 * workflows generate their own executions
  */
 type WorkflowExecution struct {
-	utils.AbstractObject                    // AbstractObject contains the basic fields of an object (id, name)
-	ExecutionsID         string             `json:"executions_id,omitempty" bson:"executions_id,omitempty"`
-	ExecDate             time.Time          `json:"execution_date,omitempty" bson:"execution_date,omitempty" validate:"required"` // ExecDate is the execution date of the workflow, is required
-	EndDate              *time.Time         `json:"end_date,omitempty" bson:"end_date,omitempty"`                                 // EndDate is the end date of the workflow
-	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
+	utils.AbstractObject                                // AbstractObject contains the basic fields of an object (id, name)
+	PeerBookByResource   map[string]map[string][]string `json:"peer_book_by_resource,omitempty" bson:"peer_book_by_resource,omitempty"` // BookByResource is a map of the resource id and the list of the booking id
+	ExecutionsID         string                         `json:"executions_id,omitempty" bson:"executions_id,omitempty"`
+	ExecDate             time.Time                      `json:"execution_date,omitempty" bson:"execution_date,omitempty" validate:"required"` // ExecDate is the execution date of the workflow, is required
+	EndDate              *time.Time                     `json:"end_date,omitempty" bson:"end_date,omitempty"`                                 // EndDate is the end date of the workflow
+	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
 }
 
 func (r *WorkflowExecution) StoreDraftDefault() {
@@ -117,6 +118,15 @@ func (d *WorkflowExecution) Book(executionsID string, wfID string, priceds map[t
 func (d *WorkflowExecution) bookEach(executionsID string, wfID string, dt tools.DataType, priceds []pricing.PricedItemITF) []*booking.Booking {
 	items := []*booking.Booking{}
 	for _, priced := range priceds {
+		if d.PeerBookByResource == nil {
+			d.PeerBookByResource = map[string]map[string][]string{}
+		}
+		if d.PeerBookByResource[priced.GetCreatorID()] == nil {
+			d.PeerBookByResource[priced.GetCreatorID()] = map[string][]string{}
+		}
+		if d.PeerBookByResource[priced.GetCreatorID()][priced.GetID()] == nil {
+			d.PeerBookByResource[priced.GetCreatorID()][priced.GetID()] = []string{}
+		}
 		start := d.ExecDate
 		if s := priced.GetLocationStart(); s != nil {
 			start = *s
@@ -124,6 +134,7 @@ func (d *WorkflowExecution) bookEach(executionsID string, wfID string, dt tools.
 		end := start.Add(time.Duration(priced.GetExplicitDurationInS()) * time.Second)
 		bookingItem := &booking.Booking{
 			AbstractObject: utils.AbstractObject{
+				UUID: uuid.New().String(),
 				Name: d.GetName() + "_" + executionsID + "_" + wfID,
 			},
 			ExecutionsID:      executionsID,
@@ -137,6 +148,8 @@ func (d *WorkflowExecution) bookEach(executionsID string, wfID string, dt tools.
 			ExpectedEndDate:   &end,
 		}
 		items = append(items, bookingItem)
+		d.PeerBookByResource[priced.GetCreatorID()][priced.GetID()] = append(
+			d.PeerBookByResource[priced.GetCreatorID()][priced.GetID()], bookingItem.GetID())
 	}
 	return items
 }
diff --git a/models/workflow_execution/workflow_scheduler.go b/models/workflow_execution/workflow_scheduler.go
index 10d8570..c551e4e 100644
--- a/models/workflow_execution/workflow_scheduler.go
+++ b/models/workflow_execution/workflow_scheduler.go
@@ -88,6 +88,7 @@ func (ws *WorkflowSchedule) CheckBooking(wfID string, request *tools.APIRequest)
 				return false, wf, execs, bookings, err
 			}
 		}
+
 	}
 	return true, wf, execs, bookings, nil
 }