diff --git a/app/domain/invoices/abacus/sales_order.rb b/app/domain/invoices/abacus/sales_order.rb
index 910963657..40b82c99d 100644
--- a/app/domain/invoices/abacus/sales_order.rb
+++ b/app/domain/invoices/abacus/sales_order.rb
@@ -53,7 +53,7 @@ def full_attrs
       def sales_order_attrs
         {
           # customer id is defined to be the same as subject id
-          customer_id: entity.person.reload.abacus_subject_key,
+          customer_id: entity.person.abacus_subject_key,
           order_date: entity.issued_at,
           delivery_date: entity.sent_at,
           total_amount: entity.total.to_f,
diff --git a/spec/abilities/json_api/external_invoice_ability_spec.rb b/spec/abilities/json_api/external_invoice_ability_spec.rb
index 9bd558728..fbd4320e6 100644
--- a/spec/abilities/json_api/external_invoice_ability_spec.rb
+++ b/spec/abilities/json_api/external_invoice_ability_spec.rb
@@ -19,6 +19,10 @@
       group: groups(:bluemlisalp_funktionaere)).person
   end
 
+  before do
+    external_invoices(:external_invoice_draft).destroy!
+  end
+
   context "index" do
     def accessible_by(user)
       ExternalInvoice.accessible_by(described_class.new(user))
diff --git a/spec/abilities/token_ability_spec.rb b/spec/abilities/token_ability_spec.rb
index 3ac082210..0ab4b3c0c 100644
--- a/spec/abilities/token_ability_spec.rb
+++ b/spec/abilities/token_ability_spec.rb
@@ -15,6 +15,10 @@
 
   let(:ability) { TokenAbility.new(token) }
 
+  before do
+    external_invoices(:external_invoice_draft).destroy!
+  end
+
   describe "index_external_invoices on Group" do
     context :root do
       let(:token) { service_tokens(:permitted_root_layer_token) }
diff --git a/spec/resources/external_invoice/reads_spec.rb b/spec/resources/external_invoice/reads_spec.rb
index 91ddf3f57..dd059efc0 100644
--- a/spec/resources/external_invoice/reads_spec.rb
+++ b/spec/resources/external_invoice/reads_spec.rb
@@ -30,6 +30,10 @@
     ]
   end
 
+  before do
+    external_invoices(:external_invoice_draft).destroy!
+  end
+
   it "serializes expected attributes" do
     render
     data = jsonapi_data[0]