diff --git a/models/workflow_execution/workflow_scheduler.go b/models/workflow_execution/workflow_scheduler.go
index e7bc20e..e08f960 100644
--- a/models/workflow_execution/workflow_scheduler.go
+++ b/models/workflow_execution/workflow_scheduler.go
@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+	"sync"
 	"time"
 
 	"cloud.o-forge.io/core/oc-lib/logs"
@@ -86,9 +87,10 @@ func (ws *WorkflowSchedule) CheckBooking(wfID string, request *tools.APIRequest)
 	}
 
 	errCh := make(chan error, len(bookings))
+	var m sync.Mutex
 	
 	for _, b := range bookings {
-		go getBooking(l, b, request, wf, execs, bookings, errCh)	
+		go getBooking(l, b, request, wf, execs, bookings, errCh, m)	
 	}
 
 	for i := 0; i < len(bookings); i++ {
@@ -100,7 +102,17 @@ func (ws *WorkflowSchedule) CheckBooking(wfID string, request *tools.APIRequest)
 	return true, wf, execs, bookings, nil
 }
 
-func getBooking(l zerolog.Logger, b *booking.Booking, request *tools.APIRequest, wf *workflow.Workflow, execs []*WorkflowExecution, bookings []*booking.Booking, errCh chan error) {
+func getBooking(l zerolog.Logger, b *booking.Booking, request *tools.APIRequest, wf *workflow.Workflow, execs []*WorkflowExecution, bookings []*booking.Booking, errCh chan error, m sync.Mutex) {
+	
+	m.Lock()
+	// deep copy du caller
+	var c tools.HTTPCaller
+	err := request.Caller.DeepCopy(c)
+	if err != nil{
+		errCh <- err
+		return
+	}
+	// Delock
 	bl := l.With().Str("booking", b.UUID).Logger()
 	meth := request.Caller.URLS[tools.BOOKING][tools.GET]
 	meth = strings.ReplaceAll(meth, ":id", b.ResourceID)
@@ -108,7 +120,7 @@ func getBooking(l zerolog.Logger, b *booking.Booking, request *tools.APIRequest,
 	meth = strings.ReplaceAll(meth, ":end_date", b.ExpectedEndDate.Format("2006-01-02T15:04:05"))
 	request.Caller.URLS[tools.BOOKING][tools.GET] = meth
 	bl.Debug().Msg("Get booking " + b.UUID + " on " + b.DestPeerID)
-	_, err := (&peer.Peer{}).LaunchPeerExecution(b.DestPeerID, b.ResourceID, tools.BOOKING, tools.GET, nil, request.Caller)
+	_, err = (&peer.Peer{}).LaunchPeerExecution(b.DestPeerID, b.ResourceID, tools.BOOKING, tools.GET, nil, &c)
 	bl.Debug().Msg("Received response from Get booking " + b.UUID + " on " + b.DestPeerID)
 	if err != nil {
 		errCh <- err
diff --git a/tools/remote_caller.go b/tools/remote_caller.go
index 96fae94..c90ab0a 100644
--- a/tools/remote_caller.go
+++ b/tools/remote_caller.go
@@ -63,6 +63,16 @@ func NewHTTPCaller(urls map[DataType]map[METHOD]string) *HTTPCaller {
 	}
 }
 
+// Creates a copy of the current caller, in order to have parallelized executions without race condition 
+func (c* HTTPCaller) DeepCopy(dst HTTPCaller) error {
+	bytes, err := json.Marshal(c)
+	if err != nil {
+		return err
+	}
+
+	return json.Unmarshal(bytes, &dst)
+}
+
 // CallGet calls the GET method on the HTTP server
 func (caller *HTTPCaller) CallGet(url string, subpath string, types ...string) ([]byte, error) {
 	req, err := http.NewRequest(http.MethodGet, url+subpath, bytes.NewBuffer([]byte("")))