diff --git a/lv/lv2500.cpp b/lv/lv2500.cpp
index 4e63a43c0..e1fd2e00c 100755
--- a/lv/lv2500.cpp
+++ b/lv/lv2500.cpp
@@ -298,8 +298,13 @@ void TFatturazione_lavanderie::post_process(TLista_documenti& doc_out, TLista_do
     bool elcons = contr.get_bool(LVCONDV_ELCONS);
     bool rifbol = contr.get_bool(LVCONDV_RIFBOL);
     bool riftest = ini_get_bool(CONFIG_DITTA, "lv", "RifTest");
+		bool liqdiff = doc.clifor().get_int(CLI_ALLEG) == 7 && doc.clifor().vendite().get_bool(CFV_FATTSOSP);
 		TAssoc_array nolo_computed;
     
+		if (liqdiff)
+			doc.put(DOC_LIQDIFF, "X");
+		else 
+			doc.zero(DOC_LIQDIFF);
     if (doc.physical_rows() > 0 && doc[1].is_descrizione())
     {
       if (elcons)