diff --git a/lib/bas/utils/operaton/process_client.rb b/lib/bas/utils/operaton/process_client.rb
index 96cbdad..8382633 100644
--- a/lib/bas/utils/operaton/process_client.rb
+++ b/lib/bas/utils/operaton/process_client.rb
@@ -40,16 +40,15 @@ def deploy_process(file_path, deployment_name:)
       def instance_with_business_key_exists?(process_key, business_key)
         query_params = {
           processDefinitionKey: process_key,
-          maxResults: 50
+          maxResults: 50,
+          active: true
         }
 
         response = get("/history/process-instance", query_params)
         response.any? { |instance| instance["businessKey"] == business_key }
       end
 
-      def start_process_instance_by_key(process_key, business_key:, variables: {}, validate_business_key: true)
-        validate_uniqueness!(process_key, business_key) if validate_business_key
-
+      def start_process_instance_by_key(process_key, business_key:, variables: {})
         json_payload = {
           businessKey: business_key,
           variables: format_variables(variables)
@@ -72,12 +71,6 @@ def build_conn
           f.adapter Faraday.default_adapter
         end
       end
-
-      def validate_uniqueness!(process_key, business_key)
-        return unless instance_with_business_key_exists?(process_key, business_key)
-
-        raise "There is already an instance for processing '#{process_key}' with business key '#{business_key}'"
-      end
     end
   end
 end
diff --git a/spec/bas/operaton/process_client_spec.rb b/spec/bas/operaton/process_client_spec.rb
index 3531597..34e98ca 100644
--- a/spec/bas/operaton/process_client_spec.rb
+++ b/spec/bas/operaton/process_client_spec.rb
@@ -79,30 +79,10 @@
         [200, { "Content-Type" => "application/json" }, '{"id": "inst1"}']
       end
 
-      allow(client).to receive(:instance_with_business_key_exists?).and_return(false)
-
       response = client.start_process_instance_by_key(process_key, business_key: business_key,
                                                                    variables: { amount: 100 })
       expect(response).to eq({ "id" => "inst1" })
     end
-
-    it "raises an error if business key already exists and validation is on" do
-      allow(client).to receive(:instance_with_business_key_exists?).with(process_key, business_key).and_return(true)
-
-      expect do
-        client.start_process_instance_by_key(process_key, business_key: business_key, validate_business_key: true)
-      end.to raise_error("There is already an instance for processing 'my-process' with business key 'biz-123'")
-    end
-
-    it "does not raise an error if business key exists and validation is off" do
-      stubs.post("#{base_url}/process-definition/key/#{process_key}/start") do
-        [200, { "Content-Type" => "application/json" }, '{"id": "inst2"}']
-      end
-
-      expect(client).not_to receive(:instance_with_business_key_exists?)
-
-      client.start_process_instance_by_key(process_key, business_key: business_key, validate_business_key: false)
-    end
   end
 
   describe "#instance_with_business_key_exists?" do