diff --git a/htdocs/core/class/html.formcontract.class.php b/htdocs/core/class/html.formcontract.class.php
index c6cf20dd5f1..28b256e32ef 100644
--- a/htdocs/core/class/html.formcontract.class.php
+++ b/htdocs/core/class/html.formcontract.class.php
@@ -64,8 +64,18 @@ class FormContract
 		$sql.= ' FROM '.MAIN_DB_PREFIX .'contrat as c';
 		$sql.= " WHERE c.entity = ".$conf->entity;
 		//if ($contratListId) $sql.= " AND c.rowid IN (".$contratListId.")";
+		if ($socid > 0)
+		{
+			// CONTRACT_ALLOW_TO_LINK_FROM_OTHER_COMPANY is 'all' or a list of ids separated by coma.
+		    	if (empty($conf->global->CONTRACT_ALLOW_TO_LINK_FROM_OTHER_COMPANY))  
+			    $sql.= " AND (c.fk_soc=".$socid." OR c.fk_soc IS NULL)";
+		    	else if ($conf->global->CONTRACT_ALLOW_TO_LINK_FROM_OTHER_COMPANY != 'all')
+			{
+		        	$sql.= " AND (c.fk_soc IN (".$socid.", ".$conf->global->CONTRACT_ALLOW_TO_LINK_FROM_OTHER_COMPANY.") ";
+				$sql.= " OR p.fk_soc IS NULL)";
+		    	}
+		}	
 		if ($socid == 0) $sql.= " AND (c.fk_soc = 0 OR c.fk_soc IS NULL)";
-		if ($socid > 0)  $sql.= " AND (c.fk_soc=".$socid." OR c.fk_soc IS NULL)";
 		$sql.= " ORDER BY c.ref ";
 
 		dol_syslog(get_class($this)."::select_contract", LOG_DEBUG);