diff --git a/htdocs/langs/en_US/accountancy.lang b/htdocs/langs/en_US/accountancy.lang
index e613d38ab05..472e2166f6b 100644
--- a/htdocs/langs/en_US/accountancy.lang
+++ b/htdocs/langs/en_US/accountancy.lang
@@ -207,6 +207,7 @@ DescThirdPartyReport=Consult here the list of third-party customers and vendors
 ListAccounts=List of the accounting accounts
 UnknownAccountForThirdparty=Unknown third-party account. We will use %s
 UnknownAccountForThirdpartyBlocking=Unknown third-party account. Blocking error
+ThirdpartyAccountNotDefinedOrThirdPartyUnknown=Third-party account not defined or third party unknown. Blocking error.
 UnknownAccountForThirdpartyAndWaitingAccountNotDefinedBlocking=Unknown third-party account and waiting account not defined. Blocking error
 PaymentsNotLinkedToProduct=Payment not linked to any product / service