diff --git a/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/BusinessPartnerService.java b/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/BusinessPartnerService.java
index bdfccdd..a56fe1a 100644
--- a/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/BusinessPartnerService.java
+++ b/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/BusinessPartnerService.java
@@ -231,7 +231,7 @@ public class BusinessPartnerService {
                 throw new PluginException(InvoicePlugin.class.getName(), ERROR_BUSINESSPARTNER_VERIFICATION,
                         "Businesspartner is in verification. Invoice can't be processed!");
             }
-            if (businessPartner.getTaskID() == TASK_LOCKED && updateWhenLocked) {
+            if (businessPartner.getTaskID() == TASK_LOCKED && !updateWhenLocked) {
                 throw new PluginException(InvoicePlugin.class.getName(), ERROR_BUSINESSPARTNER_LOCKED,
                         "Businesspartner is locked. Invoice can't be processed!");
             }