diff --git a/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/einvoice/KSeFInvoiceLineBuilder.java b/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/einvoice/KSeFInvoiceLineBuilder.java
index cbd2cca..569e7ce 100644
--- a/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/einvoice/KSeFInvoiceLineBuilder.java
+++ b/office-alexander-logistics-app/src/main/java/com/alexanderlogistics/einvoice/KSeFInvoiceLineBuilder.java
@@ -102,7 +102,13 @@ public class KSeFInvoiceLineBuilder {
         String currency = workitem.getItemValueString("invoice.currency");
         if (!"PLN".equalsIgnoreCase(currency) && !currency.isBlank()) {
             BigDecimal exchangeRate = BigDecimal.valueOf(workitem.getItemValueDouble("invoice.rate"));
-            writeForeignCurrencyFields(model, elementFa, aggregates, exchangeRate);
+
+            // 11.05.2026 - Maciej Budas:
+            // Exchange rate in KSeF is used CargoSoft format (EUR=PLN), whereas it should
+            // be PLN=EUR (i.e., 4.2537). To get the correct data in KSeF, there is just to
+            // divide 1 by the current rate (1 / 0.235089).
+            BigDecimal invertedRate = BigDecimal.ONE.divide(exchangeRate, 4, RoundingMode.HALF_UP);
+            writeForeignCurrencyFields(model, elementFa, aggregates, invertedRate);
         }
 
         // Phase 4: remove all summary placeholders that were not filled.
diff --git a/office-alexander-logistics-app/src/test/resources/ksef/ksef.xml b/office-alexander-logistics-app/src/test/resources/ksef/ksef.xml
index 42f711d..6e7da29 100644
--- a/office-alexander-logistics-app/src/test/resources/ksef/ksef.xml
+++ b/office-alexander-logistics-app/src/test/resources/ksef/ksef.xml
@@ -85,8 +85,14 @@
             <!-- Keine Selbstfakturierung -->
             <P_17>2</P_17>
 
-            <!-- Kein Reverse Charge -->
-            <P_18>2</P_18>
+            <!-- Kein Reverse Charge
+               11.5.2026 Maciej Budas : 
+               Please apply this change to all upcoming invoices to ensure the "Reverse Charge" (Odwrotne
+            obciazenie) flag is correctly set to "True".
+
+               Means we change the value from 2 to 1
+                -->
+            <P_18>1</P_18>
 
             <!-- Kein Split Payment (Rechnung unter 15.000 PLN/EUR) -->
             <P_18A>2</P_18A>
diff --git a/workflow/pl/e-invoice/templates/ksef.xml b/workflow/pl/e-invoice/templates/ksef.xml
index 42f711d..6e7da29 100644
--- a/workflow/pl/e-invoice/templates/ksef.xml
+++ b/workflow/pl/e-invoice/templates/ksef.xml
@@ -85,8 +85,14 @@
             <!-- Keine Selbstfakturierung -->
             <P_17>2</P_17>
 
-            <!-- Kein Reverse Charge -->
-            <P_18>2</P_18>
+            <!-- Kein Reverse Charge
+               11.5.2026 Maciej Budas : 
+               Please apply this change to all upcoming invoices to ensure the "Reverse Charge" (Odwrotne
+            obciazenie) flag is correctly set to "True".
+
+               Means we change the value from 2 to 1
+                -->
+            <P_18>1</P_18>
 
             <!-- Kein Split Payment (Rechnung unter 15.000 PLN/EUR) -->
             <P_18A>2</P_18A>