diff --git a/models/common/pricing/interfaces.go b/models/common/pricing/interfaces.go
index 30c6f79..55ee888 100755
--- a/models/common/pricing/interfaces.go
+++ b/models/common/pricing/interfaces.go
@@ -9,6 +9,7 @@ import (
 
 type PricedItemITF interface {
 	GetID() string
+	GetInstanceID() string
 	GetType() tools.DataType
 	IsPurchasable() bool
 	IsBooked() bool
diff --git a/models/resources/priced_resource.go b/models/resources/priced_resource.go
index c6b67f1..4ccf019 100755
--- a/models/resources/priced_resource.go
+++ b/models/resources/priced_resource.go
@@ -47,6 +47,10 @@ func (abs *PricedResource) GetID() string {
 	return abs.ResourceID
 }
 
+func (abs *PricedResource) GetInstanceID() string {
+	return abs.InstanceID
+}
+
 func (abs *PricedResource) GetType() tools.DataType {
 	return abs.ResourceType
 }
diff --git a/models/workflow_execution/workflow_execution.go b/models/workflow_execution/workflow_execution.go
index bec36e5..750d609 100755
--- a/models/workflow_execution/workflow_execution.go
+++ b/models/workflow_execution/workflow_execution.go
@@ -162,6 +162,7 @@ func (d *WorkflowExecution) buyEach(bs pricing.BillingStrategy, executionsID str
 			ExecutionsID: executionsID,
 			DestPeerID:   priced.GetCreatorID(),
 			ResourceID:   priced.GetID(),
+			InstanceID:   priced.GetInstanceID(),
 			ResourceType: dt,
 			EndDate:      &end,
 		}
@@ -212,6 +213,7 @@ func (d *WorkflowExecution) bookEach(executionsID string, wfID string, dt tools.
 			ExecutionsID:      executionsID,
 			State:             enum.SCHEDULED,
 			ResourceID:        priced.GetID(),
+			InstanceID:        priced.GetInstanceID(),
 			ResourceType:      dt,
 			DestPeerID:        priced.GetCreatorID(),
 			WorkflowID:        wfID,