Fix warning

htdocs/core/modules/commande/doc/pdf_einstein.modules.php

@@ -706,6 +706,7 @@ class pdf_einstein extends ModelePDFCommandes
 	protected function _tableau_versements(&$pdf, $object, $posy, $outputlangs)
 	{
 		// phpcs:enable
+		return 1;
 	}
 
 	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.PublicUnderscore

htdocs/core/modules/commande/doc/pdf_eratosthene.modules.php

@@ -927,6 +927,7 @@ class pdf_eratosthene extends ModelePDFCommandes
 	 */
 	protected function drawPaymentsTable(&$pdf, $object, $posy, $outputlangs)
 	{
+		return 0;
 	}
 
 	/**
@@ -1733,7 +1734,7 @@ class pdf_eratosthene extends ModelePDFCommandes
 	 *      @param	int				$hidedetails	Do not show line details
 	 *      @param	int				$hidedesc		Do not show desc
 	 *      @param	int				$hideref		Do not show ref
-	 *      @return	null
+	 *      @return	void
 	 */
 	public function defineColumnField($object, $outputlangs, $hidedetails = 0, $hidedesc = 0, $hideref = 0)
 	{