diff --git a/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/InvoicePlugin.java b/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/InvoicePlugin.java
index 0cb5cf5..0c4d8a6 100644
--- a/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/InvoicePlugin.java
+++ b/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/InvoicePlugin.java
@@ -190,8 +190,8 @@ public class InvoicePlugin extends AbstractPlugin {
             LocalDate localDate = LocalDate.now();
             int year = localDate.getYear();
             // build regex....
-            String regex = "(" + year + "|" + (year + 1) + ")(1[0-2]|0[1-9])";
-
+            String regex = "(" + year + "|" + (year + 1) + "|" + (year - 1) + ")(1[0-2]|0[1-9])";
+            
             if (!period.matches(regex)) {
                 // throw a plugin exception - because name is missing!
                 throw new PluginException(InvoicePlugin.class.getName(), ERROR_MISSING_DATA,