diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/GenericResourceAllocation.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/GenericResourceAllocation.java
index a5d30a664..5614c6631 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/GenericResourceAllocation.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/GenericResourceAllocation.java
@@ -257,4 +257,8 @@ public class GenericResourceAllocation extends
         return new ArrayList<Resource>(resources);
     }
 
+    public IAllocatable withPreviousAssociatedResources() {
+        return forResources(getAssociatedResources());
+    }
+
 }
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ShareDivision.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ShareDivision.java
index ef8a9a51a..e14d439e6 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ShareDivision.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/entities/ShareDivision.java
@@ -113,7 +113,7 @@ public class ShareDivision {
             remainderIncrease = remainderIncrease - bucket.getIncreaseDone();
             assert remainderIncrease >= 0;
         }
-        assert remainderIncrease == 0 : "all is assigned";
+        assert remainderIncrease == 0 || shares.isEmpty() : "all is assigned";
         return ShareDivision.create(fromWrappers(wrapped));
     }
 
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java
index 8b734ee04..a96ca2111 100644
--- a/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/test/planner/entities/GenericResourceAllocationTest.java
@@ -359,4 +359,28 @@ public class GenericResourceAllocationTest {
         return new HashSet<Resource>(associatedResources);
     }
 
+    @Test
+    public void canAllocateHoursOnIntervalUsingPreviousResources() {
+        final int workableHoursDay = 8;
+        givenBaseCalendarWithoutExceptions(workableHoursDay);
+        LocalDate start = new LocalDate(2006, 10, 5);
+        final int days = 4;
+        givenTaskWithStartAndEnd(toInterval(start, Period.days(days)));
+        givenGenericResourceAllocationForTask(task);
+        givenWorkersWithLoads(3, 12, 1);
+
+        genericResourceAllocation.forResources(workers).allocate(
+                ResourcesPerDay.amount(1));
+
+        final int hoursOnSubinterval = 3;
+        int daysSubinterval = 2;
+        genericResourceAllocation.withPreviousAssociatedResources().onInterval(
+                start,
+                start.plusDays(daysSubinterval)).allocateHours(
+                hoursOnSubinterval);
+        assertThat(genericResourceAllocation.getAssignedHours(),
+                equalTo(hoursOnSubinterval + (days - daysSubinterval)
+                        * workableHoursDay));
+    }
+
 }