diff --git a/models/workflow/workflow.go b/models/workflow/workflow.go
index 09815d4..1ef68fb 100644
--- a/models/workflow/workflow.go
+++ b/models/workflow/workflow.go
@@ -128,8 +128,8 @@ func (wfa *Workflow) CheckBooking(caller *tools.HTTPCaller) (bool, error) {
 	return true, nil
 }
 
-func (wf *Workflow) Planify(start time.Time, end *time.Time, request *tools.APIRequest) (float64, map[tools.DataType][]pricing.PricedItemITF, *Workflow, error) {
-	priceds := map[tools.DataType][]pricing.PricedItemITF{}
+func (wf *Workflow) Planify(start time.Time, end *time.Time, request *tools.APIRequest) (float64, map[tools.DataType]map[string]pricing.PricedItemITF, *Workflow, error) {
+	priceds := map[tools.DataType]map[string]pricing.PricedItemITF{}
 	ps, priceds, err := plan[*resources.ProcessingResource](tools.PROCESSING_RESOURCE, wf, priceds, request, wf.Graph.IsProcessing,
 		func(res resources.ResourceInterface, priced pricing.PricedItemITF) (time.Time, float64) {
 			return start.Add(time.Duration(wf.Graph.GetAverageTimeProcessingBeforeStart(0, res.GetID(), request)) * time.Second), priced.GetExplicitDurationInS()
@@ -189,12 +189,12 @@ func (wf *Workflow) Planify(start time.Time, end *time.Time, request *tools.APIR
 	return longest, priceds, wf, nil
 }
 
-func plan[T resources.ResourceInterface](dt tools.DataType, wf *Workflow, priceds map[tools.DataType][]pricing.PricedItemITF, request *tools.APIRequest,
-	f func(graph.GraphItem) bool, start func(resources.ResourceInterface, pricing.PricedItemITF) (time.Time, float64), end func(time.Time, float64) *time.Time) ([]T, map[tools.DataType][]pricing.PricedItemITF, error) {
+func plan[T resources.ResourceInterface](dt tools.DataType, wf *Workflow, priceds map[tools.DataType]map[string]pricing.PricedItemITF, request *tools.APIRequest,
+	f func(graph.GraphItem) bool, start func(resources.ResourceInterface, pricing.PricedItemITF) (time.Time, float64), end func(time.Time, float64) *time.Time) ([]T, map[tools.DataType]map[string]pricing.PricedItemITF, error) {
 	resources := []T{}
 	for _, item := range wf.GetGraphItems(f) {
 		if priceds[dt] == nil {
-			priceds[dt] = []pricing.PricedItemITF{}
+			priceds[dt] = map[string]pricing.PricedItemITF{}
 		}
 		dt, realItem := item.GetResource()
 		if realItem == nil {
@@ -212,7 +212,7 @@ func plan[T resources.ResourceInterface](dt tools.DataType, wf *Workflow, priced
 			priced.SetLocationEnd(*e)
 		}
 		resources = append(resources, realItem.(T))
-		priceds[dt] = append(priceds[dt], priced)
+		priceds[dt][item.ID] = priced
 	}
 	return resources, priceds, nil
 }