diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/subcontract/ReportAdvancesModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/subcontract/ReportAdvancesModel.java
index 06b474a45..f3c4134fb 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/subcontract/ReportAdvancesModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/subcontract/ReportAdvancesModel.java
@@ -39,6 +39,7 @@ import org.navalplanner.business.advance.bootstrap.PredefinedAdvancedTypes;
 import org.navalplanner.business.advance.daos.IAdvanceAssignmentDAO;
 import org.navalplanner.business.advance.entities.AdvanceMeasurement;
 import org.navalplanner.business.advance.entities.DirectAdvanceAssignment;
+import org.navalplanner.business.common.daos.IConfigurationDAO;
 import org.navalplanner.business.externalcompanies.entities.ExternalCompany;
 import org.navalplanner.business.orders.daos.IOrderElementDAO;
 import org.navalplanner.business.orders.entities.Order;
@@ -76,6 +77,9 @@ public class ReportAdvancesModel implements IReportAdvancesModel {
     @Autowired
     private IAdvanceAssignmentDAO advanceAssignmentDAO;
 
+    @Autowired
+    private IConfigurationDAO configurationDAO;
+
     @Override
     @Transactional(readOnly = true)
     public List<Order> getOrdersWithExternalCodeInAnyOrderElement() {
@@ -260,8 +264,12 @@ public class ReportAdvancesModel implements IReportAdvancesModel {
             }
         }
 
-        return new OrderElementWithAdvanceMeasurementsListDTO(
+        return new OrderElementWithAdvanceMeasurementsListDTO(getCompanyCode(),
                 orderElementWithAdvanceMeasurementsDTOs);
     }
 
+    private String getCompanyCode() {
+        return configurationDAO.getConfiguration().getCompanyCode();
+    }
+
 }
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/api/OrderElementWithAdvanceMeasurementsListDTO.java b/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/api/OrderElementWithAdvanceMeasurementsListDTO.java
index f035d78cb..76256ffac 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/api/OrderElementWithAdvanceMeasurementsListDTO.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/api/OrderElementWithAdvanceMeasurementsListDTO.java
@@ -23,6 +23,7 @@ package org.navalplanner.ws.subcontract.api;
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.xml.bind.annotation.XmlAttribute;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 
@@ -36,14 +37,18 @@ import org.navalplanner.business.orders.entities.OrderElement;
 @XmlRootElement(name = "order-element-list")
 public class OrderElementWithAdvanceMeasurementsListDTO {
 
+    @XmlAttribute(name = "external-company-nif")
+    public String externalCompanyNif;
+
     @XmlElement(name = "order-element")
     public List<OrderElementWithAdvanceMeasurementsDTO> orderElements = new ArrayList<OrderElementWithAdvanceMeasurementsDTO>();
 
     public OrderElementWithAdvanceMeasurementsListDTO() {
     }
 
-    public OrderElementWithAdvanceMeasurementsListDTO(
+    public OrderElementWithAdvanceMeasurementsListDTO(String externalCompanyNif,
             List<OrderElementWithAdvanceMeasurementsDTO> orderElements) {
+        this.externalCompanyNif = externalCompanyNif;
         this.orderElements = orderElements;
     }
 
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/impl/ReportAdvancesServiceREST.java b/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/impl/ReportAdvancesServiceREST.java
index 9a3823877..3b4009279 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/impl/ReportAdvancesServiceREST.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/ws/subcontract/impl/ReportAdvancesServiceREST.java
@@ -30,6 +30,7 @@ import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
 
+import org.apache.commons.lang.StringUtils;
 import org.joda.time.LocalDate;
 import org.navalplanner.business.advance.bootstrap.PredefinedAdvancedTypes;
 import org.navalplanner.business.advance.entities.AdvanceMeasurement;
@@ -38,6 +39,8 @@ import org.navalplanner.business.advance.exceptions.DuplicateAdvanceAssignmentFo
 import org.navalplanner.business.advance.exceptions.DuplicateValueTrueReportGlobalAdvanceException;
 import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.common.exceptions.ValidationException;
+import org.navalplanner.business.externalcompanies.daos.IExternalCompanyDAO;
+import org.navalplanner.business.externalcompanies.entities.ExternalCompany;
 import org.navalplanner.business.orders.daos.IOrderElementDAO;
 import org.navalplanner.business.orders.entities.OrderElement;
 import org.navalplanner.ws.common.api.AdvanceMeasurementDTO;
@@ -66,6 +69,9 @@ public class ReportAdvancesServiceREST implements IReportAdvancesService {
     @Autowired
     private IOrderElementDAO orderElementDAO;
 
+    @Autowired
+    private IExternalCompanyDAO externalCompanyDAO;
+
     private InstanceConstraintViolationsListDTO getErrorMessage(String code,
             String message) {
         // FIXME review errors returned
@@ -84,6 +90,27 @@ public class ReportAdvancesServiceREST implements IReportAdvancesService {
 
         InstanceConstraintViolationsDTO instanceConstraintViolationsDTO = null;
 
+        if (StringUtils
+                .isEmpty(orderElementWithAdvanceMeasurementsListDTO.externalCompanyNif)) {
+            return getErrorMessage("", "external company nif not specified");
+        }
+
+        ExternalCompany externalCompany;
+        try {
+            externalCompany = externalCompanyDAO
+                    .findUniqueByNif(orderElementWithAdvanceMeasurementsListDTO.externalCompanyNif);
+        } catch (InstanceNotFoundException e1) {
+            return getErrorMessage(
+                    orderElementWithAdvanceMeasurementsListDTO.externalCompanyNif,
+                    "external company not found");
+        }
+
+        if (!externalCompany.isSubcontractor()) {
+            return getErrorMessage(
+                    orderElementWithAdvanceMeasurementsListDTO.externalCompanyNif,
+                    "external company is not registered as subcontractor");
+        }
+
         List<OrderElementWithAdvanceMeasurementsDTO> orderElements = orderElementWithAdvanceMeasurementsListDTO.orderElements;
         for (OrderElementWithAdvanceMeasurementsDTO orderElementWithAdvanceMeasurementsDTO : orderElements) {
             try {
diff --git a/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/ReportAdvancesServiceTest.java b/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/ReportAdvancesServiceTest.java
index 110b5a4ac..6bfbf1f19 100644
--- a/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/ReportAdvancesServiceTest.java
+++ b/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/ReportAdvancesServiceTest.java
@@ -38,6 +38,7 @@ import java.util.UUID;
 
 import javax.annotation.Resource;
 
+import org.hibernate.SessionFactory;
 import org.joda.time.LocalDate;
 import org.junit.Before;
 import org.junit.Test;
@@ -46,6 +47,8 @@ import org.navalplanner.business.IDataBootstrap;
 import org.navalplanner.business.advance.entities.AdvanceMeasurement;
 import org.navalplanner.business.advance.entities.DirectAdvanceAssignment;
 import org.navalplanner.business.common.daos.IConfigurationDAO;
+import org.navalplanner.business.externalcompanies.daos.IExternalCompanyDAO;
+import org.navalplanner.business.externalcompanies.entities.ExternalCompany;
 import org.navalplanner.business.orders.daos.IOrderDAO;
 import org.navalplanner.business.orders.entities.Order;
 import org.navalplanner.business.orders.entities.OrderElement;
@@ -92,6 +95,26 @@ public class ReportAdvancesServiceTest {
     @Autowired
     private IConfigurationDAO configurationDAO;
 
+    @Autowired
+    private IExternalCompanyDAO externalCompanyDAO;
+
+    @Autowired
+    private SessionFactory sessionFactory;
+
+    private ExternalCompany getSubcontractorExternalCompanySaved(String name,
+            String nif) {
+        ExternalCompany externalCompany = ExternalCompany.create(name, nif);
+        externalCompany.setSubcontractor(true);
+
+        externalCompanyDAO.save(externalCompany);
+        externalCompanyDAO.flush();
+        sessionFactory.getCurrentSession().evict(externalCompany);
+
+        externalCompany.dontPoseAsTransientObjectAnymore();
+
+        return externalCompany;
+    }
+
     @Test
     public void validAdvancesReport() {
         Order order = givenValidOrderAlreadyStored();
@@ -135,7 +158,11 @@ public class ReportAdvancesServiceTest {
         advanceMeasurementDTOs.add(new AdvanceMeasurementDTO(date, value));
         orderElementWithAdvanceMeasurementsDTO.advanceMeasurements = advanceMeasurementDTOs;
 
-        return new OrderElementWithAdvanceMeasurementsListDTO(Arrays
+        ExternalCompany externalCompany = getSubcontractorExternalCompanySaved(
+                "Company", "company-nif");
+
+        return new OrderElementWithAdvanceMeasurementsListDTO(externalCompany
+                .getNif(), Arrays
                 .asList(orderElementWithAdvanceMeasurementsDTO));
     }
 
diff --git a/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/SubcontractServiceTest.java b/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/SubcontractServiceTest.java
index 1494700b0..dadb9985f 100644
--- a/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/SubcontractServiceTest.java
+++ b/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/subcontract/SubcontractServiceTest.java
@@ -40,7 +40,6 @@ import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.navalplanner.business.IDataBootstrap;
-import org.navalplanner.business.common.daos.IConfigurationDAO;
 import org.navalplanner.business.externalcompanies.daos.IExternalCompanyDAO;
 import org.navalplanner.business.externalcompanies.entities.ExternalCompany;
 import org.navalplanner.business.orders.daos.IOrderDAO;
@@ -94,9 +93,6 @@ public class SubcontractServiceTest {
     @Autowired
     private SessionFactory sessionFactory;
 
-    @Autowired
-    private IConfigurationDAO configurationDAO;
-
     private OrderLineDTO givenBasicOrderLineDTO(String orderLineCode) {
         OrderLineDTO orderLineDTO = new OrderLineDTO();
         orderLineDTO.name = "Test";