diff --git a/ReportImp/FeidPartnerReports/Invoicing/CollectiveInvoiceCreation.cs b/ReportImp/FeidPartnerReports/Invoicing/CollectiveInvoiceCreation.cs
index 6159e068d..56c65a307 100644
--- a/ReportImp/FeidPartnerReports/Invoicing/CollectiveInvoiceCreation.cs
+++ b/ReportImp/FeidPartnerReports/Invoicing/CollectiveInvoiceCreation.cs
@@ -67,6 +67,14 @@ namespace FeidPartnerReports.Invoicing
 
             if (supportConceptApprovalPeriod.ServiceCategory != null && data != null && data.Count > 0)
             {
+                if (supportConceptApprovalPeriod.StartDate.HasValue && supportConceptApprovalPeriod.StartDate.Value > start)
+                {
+                    start = supportConceptApprovalPeriod.StartDate.Value;
+                }
+                if (supportConceptApprovalPeriod.EndDate.HasValue && supportConceptApprovalPeriod.EndDate.Value < end)
+                {
+                    end = supportConceptApprovalPeriod.EndDate.Value;
+                }
                 decimal preis = (decimal)Math.Round((double)data[0].AmountTotal, 2, MidpointRounding.AwayFromZero);
                 decimal days = (decimal)(end - start).TotalDays + 1;