diff --git a/src/fp/fp0400.cpp b/src/fp/fp0400.cpp
index a2b97c170..33021b9cc 100644
--- a/src/fp/fp0400.cpp
+++ b/src/fp/fp0400.cpp
@@ -328,7 +328,7 @@ void TPassive_mask::aggiungi_riga(TLocalisamfile& clifo, TSheet_field& sf, TShee
 
 		if (filter_elab == FILTER_NOASS)
 		{
-			if (forn_code<0)
+			if (forn_code<0 && forn_code != tipo_forn_4)
 			{
 				const int row = sf.set_row_cell(S_ANNO, fp_db().sq_get_int("ANNO"));
 				sf.set_row_cell(S_TIPODOCSDI, tiposdi, row);