diff --git a/acqui.simple/additem.pl b/acqui.simple/additem.pl
index 5102006684..c69616a13e 100755
--- a/acqui.simple/additem.pl
+++ b/acqui.simple/additem.pl
@@ -27,6 +27,7 @@ use C4::Interface::CGI::Output;
 use C4::Biblio;
 use C4::Context;
 use C4::Koha; # XXX subfield_is_koha_internal_p
+use C4::Search;
 use HTML::Template;
 use MARC::File::USMARC;
 
@@ -58,6 +59,7 @@ my $tagslib = &MARCgettagslib($dbh,1);
 my $record = MARCgetbiblio($dbh,$bibid);
 my $itemrecord;
 my $nextop="additem";
+my @errors; # store errors found while checking data BEFORE saving item.
 #------------------------------------------------------------------------------------------------------------------------------
 if ($op eq "additem") {
 #------------------------------------------------------------------------------------------------------------------------------
@@ -73,9 +75,20 @@ if ($op eq "additem") {
 		$indicators{$ind_tag[$i]} = $indicator[$i];
 	}
 	my $record = MARChtml2marc($dbh,\@tags,\@subfields,\@values,%indicators);
+# check for item barcode # being unique
+	my $oldbibid = MARCmarc2koha($dbh,$record);
+	my $exists = itemdata($oldbibid->{'barcode'});
+	push @errors,"barcode_not_unique" if($exists);
 # MARC::Record builded => now, record in DB
-	my ($oldbiblionumber,$oldbibnum,$oldbibitemnum) = NEWnewitem($dbh,$record,$bibid);
-	$nextop = "additem";
+	# if barcode exists, don't create, but report The problem.
+	my ($oldbiblionumber,$oldbibnum,$oldbibitemnum) = NEWnewitem($dbh,$record,$bibid) unless ($exists);
+	if ($exists) {
+		$nextop = "additem";
+		$itemrecord = $record;
+		warn "==>".$record->as_formatted;
+	} else {
+		$nextop = "additem";
+	}
 #------------------------------------------------------------------------------------------------------------------------------
 } elsif ($op eq "edititem") {
 #------------------------------------------------------------------------------------------------------------------------------
@@ -253,4 +266,7 @@ $template->param(item_loop => \@item_value_loop,
 						itemtagsubfield =>$itemtagsubfield,
 						op => $nextop,
 						opisadd => ($nextop eq "saveitem")?0:1);
+foreach my $error (@errors) {
+	$template->param($error => 1);
+}
 output_html_with_http_headers $input, $cookie, $template->output;
diff --git a/koha-tmpl/intranet-tmpl/default/en/acqui.simple/additem.tmpl b/koha-tmpl/intranet-tmpl/default/en/acqui.simple/additem.tmpl
index 81fa86cc77..455ad2dfa7 100644
--- a/koha-tmpl/intranet-tmpl/default/en/acqui.simple/additem.tmpl
+++ b/koha-tmpl/intranet-tmpl/default/en/acqui.simple/additem.tmpl
@@ -24,6 +24,7 @@
 </table>
 <br />
 <center>
+
 <DIV name="10XX" id="10XX">
 <table border=1 cellspacing=0 cellpadding=5 width=80%>
 	<tr  background="<TMPL_VAR name="themelang">/images/background-mem.gif">
@@ -43,6 +44,7 @@
 </table>
 </DIV>
 <br /><br />
+
 <table border=1 cellspacing=0 cellpadding=5 width=80%>
 	<tr  background="<TMPL_VAR name="themelang">/images/background-mem.gif">
 		<th>New Item</th>
@@ -63,6 +65,9 @@
 	</tmpl_loop>
 </table>
 <input type="hidden" name="itemnum" value="<TMPL_VAR name="itemnum">">
+<TMPL_IF name="barcode_not_unique">
+	<div id="problem"><b>ERROR : Barcode already exists !<b></div>
+</TMPL_IF>
 <TMPL_IF name="opisadd">
 <input type="button" value="Add item" onClick='Check(this.form)' accesskey="w">
 <TMPL_ELSE>
diff --git a/koha-tmpl/intranet-tmpl/default/en/includes/common-style.css b/koha-tmpl/intranet-tmpl/default/en/includes/common-style.css
index 2f3742dd72..ef0d3a35fb 100644
--- a/koha-tmpl/intranet-tmpl/default/en/includes/common-style.css
+++ b/koha-tmpl/intranet-tmpl/default/en/includes/common-style.css
@@ -13,6 +13,10 @@
 	background-image:url("/intranet-tmpl/default/en/images/background-mem.gif");
 }
 
+#problem {
+	color: red;
+	font-weight:bold;
+}
 #menubar {
 	border-top:1px solid #666666;
 	font: 1.2em sans-serif;
diff --git a/koha-tmpl/intranet-tmpl/default/fr/acqui.simple/additem.tmpl b/koha-tmpl/intranet-tmpl/default/fr/acqui.simple/additem.tmpl
index 34665eb5be..e86a52b48d 100644
--- a/koha-tmpl/intranet-tmpl/default/fr/acqui.simple/additem.tmpl
+++ b/koha-tmpl/intranet-tmpl/default/fr/acqui.simple/additem.tmpl
@@ -63,6 +63,9 @@
 	</tmpl_loop>
 </table>
 <input type="hidden" name="itemnum" value="<TMPL_VAR name="itemnum">">
+<TMPL_IF name="barcode_not_unique">
+	<div id="problem"><b>ERROR : Barcode already exists !<b></div>
+</TMPL_IF>
 <TMPL_IF name="opisadd">
 <input type="button" value="Enregistrer" onClick='Check(this.form)' accesskey="w">
 <TMPL_ELSE>