diff --git a/CUST/TWYN/xsl/TWYN.xsl b/CUST/TWYN/xsl/TWYN.xsl
index 15d8944ab3..08a229cb8a 100644
--- a/CUST/TWYN/xsl/TWYN.xsl
+++ b/CUST/TWYN/xsl/TWYN.xsl
@@ -2592,7 +2592,8 @@
             <xsl:for-each select="//data_row[FACTUURSTATUS = 6]">
                 <xsl:sort select="FACTUURDATUM"/>
                 <xsl:sort select="CONTRACTANT"/>
-                <xsl:sort select="FACTUURNR"/>
+                <xsl:sort select="FACTUURNUMMER"/>
+                <xsl:sort select="FACTUURVOLGNR" data-type="number"/>
                 <xsl:variable name="v_bedrag_exc" select="BEDRAGEXCL"/>
                 <xsl:variable name="v_bedrag_btw" select="BEDRAGBTW"/>
                 <xsl:variable name="v_bedrag_inc" select="$v_bedrag_exc + $v_bedrag_btw"/>
@@ -2634,18 +2635,30 @@
     <xsl:template name="GET_PERIODE">
         <xsl:param name="p_periode_veld"/>
 
+            <xsl:variable name="v_default_van">
+                <xsl:value-of select="//data_row/STARTDATUM_P"/>
+            </xsl:variable>
             <xsl:variable name="v_periode_all">
                 <xsl:if test="substring-after(//rapport/where, $p_periode_veld) != ''">
                     <xsl:value-of select="substring-after(//rapport/where, $p_periode_veld)"/>
                 </xsl:if>
             </xsl:variable>
 
-            <xsl:variable name="v_periode_van">
-                <xsl:if test="contains($v_periode_all, 'BETWEEN') or contains($v_periode_all, '>=')">
+            <xsl:variable name="v_periode_start">
+                <xsl:if test="contains($v_periode_all, 'BETWEEN') or contains($v_periode_all, '&gt;=')">
                     <xsl:value-of select='substring-before(substring-after($v_periode_all, "to_date(&apos;") ," ")'/>
                 </xsl:if>
             </xsl:variable>
 
+            <xsl:variable name="v_periode_van">
+                <xsl:if test="$v_periode_start != ''">
+                    <xsl:value-of select="$v_periode_start"/>
+                </xsl:if>
+                <xsl:if test="$v_periode_start = '' and $v_default_van != ''">
+                    <xsl:value-of select="$v_default_van"/>
+                </xsl:if>
+            </xsl:variable>
+
             <xsl:variable name="v_periode_tot">
                 <xsl:if test="contains($v_periode_all, 'BETWEEN')">
                     <xsl:value-of select='substring-before(substring-after(substring-after($v_periode_all, "to_date"), "to_date(&apos;") ," ")'/>