diff --git a/ems-core/src/main/java/it/integry/ems/rules/completing/AccountingRules.java b/ems-core/src/main/java/it/integry/ems/rules/completing/AccountingRules.java
index cc0395797d..4ed36149b3 100644
--- a/ems-core/src/main/java/it/integry/ems/rules/completing/AccountingRules.java
+++ b/ems-core/src/main/java/it/integry/ems/rules/completing/AccountingRules.java
@@ -183,7 +183,7 @@ public class AccountingRules extends QueryRules {
 
         if (!UtilityString.isNullOrEmpty(codBiva)) {
             for (CtbMovi ctbMovi : ctbMovt.getCtbMovi()) {
-                if (UtilityString.isNullOrEmpty(ctbMovi.getCodBiva())) {
+                if (UtilityString.isNullOrEmpty(ctbMovi.getCodBiva()) && !ctbMovi.getCodBiva().equalsIgnoreCase(EmsRestConstants.NULL)) {
                     ctbMovi.setCodBiva(codBiva);
                 }
                 movi.add(ctbMovi);