diff --git a/htdocs/core/modules/import/import_csv.modules.php b/htdocs/core/modules/import/import_csv.modules.php
index 16568288aa4..08eb9a6f42d 100644
--- a/htdocs/core/modules/import/import_csv.modules.php
+++ b/htdocs/core/modules/import/import_csv.modules.php
@@ -819,11 +819,18 @@ class ImportCsv extends ModeleImports
 						$updatedone = false;
 						$insertdone = false;
 
+						$is_table_category_link = false;
+						$fname = 'rowid';
+						if (strpos($tablename, '_categorie_') !== false) {
+							$is_table_category_link = true;
+							$fname='*';
+						}
+
 						if (!empty($updatekeys)) {
 							// We do SELECT to get the rowid, if we already have the rowid, it's to be used below for related tables (extrafields)
 
 							if (empty($lastinsertid)) {	// No insert done yet for a parent table
-								$sqlSelect = "SELECT rowid FROM ".$tablename;
+								$sqlSelect = "SELECT ".$fname." FROM ".$tablename;
 
 								$data = array_combine($listfields, $listvalues);
 								$where = array();
@@ -842,6 +849,7 @@ class ImportCsv extends ModeleImports
 									if ($num_rows == 1) {
 										$res = $this->db->fetch_object($resql);
 										$lastinsertid = $res->rowid;
+										if ($is_table_category_link) $lastinsertid = 'linktable'; // used to apply update on tables like llx_categorie_product and avoid being blocked for all file content if at least one entry already exists
 										$last_insert_id_array[$tablename] = $lastinsertid;
 									} elseif ($num_rows > 1) {
 										$this->errors[$error]['lib'] = $langs->trans('MultipleRecordFoundWithTheseFilters', implode(', ', $filters));
@@ -903,6 +911,10 @@ class ImportCsv extends ModeleImports
 								}
 								$sqlend = " WHERE ".$keyfield." = ".((int) $lastinsertid);
 
+								if ($is_table_category_link) {
+									$sqlend = " WHERE " . implode(' AND ', $where);
+								}
+
 								$sql = $sqlstart.$sqlend;
 
 								// Run update request
diff --git a/htdocs/core/modules/import/import_xlsx.modules.php b/htdocs/core/modules/import/import_xlsx.modules.php
index d16a9a764eb..7be4ee8894a 100644
--- a/htdocs/core/modules/import/import_xlsx.modules.php
+++ b/htdocs/core/modules/import/import_xlsx.modules.php
@@ -863,11 +863,19 @@ class ImportXlsx extends ModeleImports
 					if (!empty($listfields)) {
 						$updatedone = false;
 						$insertdone = false;
+
+						$is_table_category_link = false;
+						$fname = 'rowid';
+						if (strpos($tablename, '_categorie_') !== false) {
+							$is_table_category_link = true;
+							$fname='*';
+						}
+
 						if (!empty($updatekeys)) {
 							// We do SELECT to get the rowid, if we already have the rowid, it's to be used below for related tables (extrafields)
 
 							if (empty($lastinsertid)) {	// No insert done yet for a parent table
-								$sqlSelect = "SELECT rowid FROM " . $tablename;
+								$sqlSelect = "SELECT ".$fname." FROM " . $tablename;
 
 								$data = array_combine($listfields, $listvalues);
 								$where = array();
@@ -886,6 +894,7 @@ class ImportXlsx extends ModeleImports
 									if ($num_rows == 1) {
 										$res = $this->db->fetch_object($resql);
 										$lastinsertid = $res->rowid;
+										if ($is_table_category_link) $lastinsertid = 'linktable'; // used to apply update on tables like llx_categorie_product and avoid being blocked for all file content if at least one entry already exists
 										$last_insert_id_array[$tablename] = $lastinsertid;
 									} elseif ($num_rows > 1) {
 										$this->errors[$error]['lib'] = $langs->trans('MultipleRecordFoundWithTheseFilters', implode(', ', $filters));
@@ -947,6 +956,10 @@ class ImportXlsx extends ModeleImports
 								}
 								$sqlend = " WHERE " . $keyfield . " = ".((int) $lastinsertid);
 
+								if ($is_table_category_link) {
+									$sqlend = " WHERE " . implode(' AND ', $where);
+								}
+
 								$sql = $sqlstart . $sqlend;
 
 								// Run update request
diff --git a/htdocs/core/modules/modCategorie.class.php b/htdocs/core/modules/modCategorie.class.php
index 6ee294eff58..9e138c6ccef 100644
--- a/htdocs/core/modules/modCategorie.class.php
+++ b/htdocs/core/modules/modCategorie.class.php
@@ -481,6 +481,7 @@ class modCategorie extends DolibarrModules
 					'cp.fk_product'=>array('rule'=>'fetchidfromref', 'classfile'=>'/product/class/product.class.php', 'class'=>'Product', 'method'=>'fetch', 'element'=>'Product')
 			);
 			$this->import_examplevalues_array[$r] = array('cp.fk_categorie'=>"rowid or label", 'cp.fk_product'=>"rowid or ref");
+			$this->import_updatekeys_array[$r] = array('cp.fk_categorie' => 'Category', 'cp.fk_product' => 'ProductRef');
 		}
 
 		// 1 Suppliers