diff --git a/dev/tools/phan/config.php b/dev/tools/phan/config.php
index 4d4e78b6bef66..1d934ad7821a1 100644
--- a/dev/tools/phan/config.php
+++ b/dev/tools/phan/config.php
@@ -450,6 +450,7 @@
 		// 'PhanPluginUnknownArrayMethodReturnType',	// Too many troubles to manage. Is enabled in config_extended only.
 		// 'PhanUndeclaredGlobalVariable',			// Helps identify variables that are not set/defined - add '@phan-var-force TYPE $varname' in tpl or includes to help type the variable
 		// 'PhanPluginUnknownObjectMethodCall',	// False positive for some class. Is enabled in config_extended only.
+		'PhanTypeSuspiciousNonTraversableForeach',  // Reports on `foreach ($object as $key => $value)` which works without php notices, so we ignore it because this is intentional in the code.
 	],
 	// You can put relative paths to internal stubs in this config option.
 	// Phan will continue using its detailed type annotations,
diff --git a/htdocs/core/modules/cheque/doc/pdf_blochet.class.php b/htdocs/core/modules/cheque/doc/pdf_blochet.class.php
index 8e6660856a74f..4510df6749049 100644
--- a/htdocs/core/modules/cheque/doc/pdf_blochet.class.php
+++ b/htdocs/core/modules/cheque/doc/pdf_blochet.class.php
@@ -109,7 +109,7 @@ public function __construct($db)
 	 *	@param	string			$_dir			Directory
 	 *	@param	string			$number			Number
 	 *	@param	Translate		$outputlangs	Lang output object
-	 *	@return	int     						1=ok, 0=ko
+	 *	@return	int<-1,1>							1 if OK, <=0 if KO
 	 */
 	public function write_file($object, $_dir, $number, $outputlangs)
 	{
diff --git a/htdocs/core/modules/cheque/modules_chequereceipts.php b/htdocs/core/modules/cheque/modules_chequereceipts.php
index d75805a1174bf..b9cf4832fc24a 100644
--- a/htdocs/core/modules/cheque/modules_chequereceipts.php
+++ b/htdocs/core/modules/cheque/modules_chequereceipts.php
@@ -111,6 +111,19 @@ public static function liste_modeles($db, $maxfilenamelength = 0)
 
 		return $list;
 	}
+
+
+	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
+	/**
+	 *	Fonction to generate document on disk
+	 *
+	 *	@param	RemiseCheque	$object			Object RemiseCheque
+	 *	@param	string			$_dir			Directory
+	 *	@param	string			$number			Number
+	 *	@param	Translate		$outputlangs	Lang output object
+	 *	@return	int<-1,1>						1 if OK, <=0 if KO
+	 */
+	abstract public function write_file($object, $_dir, $number, $outputlangs);
 }
 
 
@@ -155,7 +168,8 @@ function chequereceipt_pdf_create($db, $id, $message, $modele, $outputlangs)
 		// We save charset_output to restore it because write_file can change it if needed for
 		// output format that does not support UTF8.
 		$sav_charset_output = $outputlangs->charset_output;
-		if ($obj->write_file($id, $outputlangs) > 0) {
+		// TODO: write_file seems invalid, function is likely no longer used - delete ?
+		if ($obj->write_file($id, $outputlangs) > 0) { // @phan-suppress-current-line PhanParamTooFew
 			$outputlangs->charset_output = $sav_charset_output;
 			return 1;
 		} else {