diff --git a/library/src/main/java/org/mustangproject/Item.java b/library/src/main/java/org/mustangproject/Item.java
index b385ee84..5c9d8976 100644
--- a/library/src/main/java/org/mustangproject/Item.java
+++ b/library/src/main/java/org/mustangproject/Item.java
@@ -45,6 +45,7 @@ public class Item implements IZUGFeRDExportableItem {
 	protected String accountingReference;
 	protected String parentLineID = null;
 	protected String lineStatusReasonCode = null;
+ 	protected TradeParty lineSeller;
 	//protected HashMap<String, String> attributes = new HashMap<>();
 
 	/***
@@ -681,4 +682,19 @@ public class Item implements IZUGFeRDExportableItem {
 		this.lineStatusReasonCode = lineStatusReasonCode;
 		return this;
 	}
+
+	/***
+	 * For line seller 
+	 * @param seller The line seller
+	 * @return fluent setter
+	 */
+    public Item setLineSeller(TradeParty seller) {
+        this.lineSeller = seller;
+        return this;
+    }
+    @Override
+    public TradeParty getLineSeller() {
+        return this.lineSeller;
+    }
+
 }
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java b/library/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java
index 7b48ab5f..38ab882b 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableItem.java
@@ -32,6 +32,7 @@ import java.util.List;
 
 import org.mustangproject.IncludedNote;
 import org.mustangproject.Item;
+import org.mustangproject.TradeParty;
 
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 
@@ -237,4 +238,13 @@ public interface IZUGFeRDExportableItem extends IAbsoluteValueProvider{
 	}
 
     default LineCalculator getCalculation() {return new LineCalculator(this); };
+	/***
+	 * For line seller 
+	 * @return the seller
+	 */
+
+	default  TradeParty getLineSeller() { 
+		return null;
+	}
+
 }
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
index c47f3669..7d8cd0fd 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
@@ -525,8 +525,13 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 					+ "</ram:ChargeAmount>" // currencyID=\"EUR\"
 					+ "<ram:BasisQuantity unitCode=\"" + XMLTools.encodeXML(currentItem.getProduct().getUnit())
 					+ "\">" + quantityFormat(currentItem.getBasisQuantity()) + "</ram:BasisQuantity>"
-					+ "</ram:NetPriceProductTradePrice>"
-					+ "</ram:SpecifiedLineTradeAgreement>"
+					+ "</ram:NetPriceProductTradePrice>";
+				  
+                if(currentItem.getLineSeller()!=null) {
+                    xml += "<ram:ItemSellerTradeParty>" + getTradePartyAsXML(currentItem.getLineSeller(), true, false) + "</ram:ItemSellerTradeParty>";
+    
+                }	            
+				xml += "</ram:SpecifiedLineTradeAgreement>"
 					+ "<ram:SpecifiedLineTradeDelivery>"
 					+ "<ram:BilledQuantity unitCode=\"" + XMLTools.encodeXML(currentItem.getProduct().getUnit()) + "\">"
 					+ quantityFormat(currentItem.getQuantity()) + "</ram:BilledQuantity>"
diff --git a/library/src/test/java/org/mustangproject/ZUGFeRD/ItemSellerTradePartyTest.java b/library/src/test/java/org/mustangproject/ZUGFeRD/ItemSellerTradePartyTest.java
new file mode 100644
index 00000000..12af7493
--- /dev/null
+++ b/library/src/test/java/org/mustangproject/ZUGFeRD/ItemSellerTradePartyTest.java
@@ -0,0 +1,105 @@
+package org.mustangproject.ZUGFeRD;
+
+import org.junit.Test;
+import org.mustangproject.Invoice;
+import org.mustangproject.Item;
+import org.mustangproject.Product;
+import org.mustangproject.TradeParty;
+
+import java.math.BigDecimal;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+import static org.xmlunit.assertj.XmlAssert.assertThat;
+
+public class ItemSellerTradePartyTest {
+
+    /**
+     * Item de test qui force un ItemSellerTradeParty au niveau ligne
+     * via la nouvelle méthode IZUGFeRDExportableItem#getItemSellerTradeParty().
+     */
+    private static class ItemWithItemSellerTradeParty extends Item {
+        private final TradeParty itemSeller;
+
+        ItemWithItemSellerTradeParty(Product product, BigDecimal price, BigDecimal quantity, TradeParty itemSeller) {
+            super(product, price, quantity);
+            this.itemSeller = itemSeller;
+        }
+
+        @Override
+        public TradeParty getLineSeller() {
+            return itemSeller;
+        }
+    }
+
+    @Test
+    public void testLineLevelItemSellerTradePartyIsExportedOnlyWhenProvided() {
+        // Header seller = vendeur contractuel (collectivité émettrice)
+        TradeParty contractualSeller = new TradeParty("Mairie A", "1 rue A", "75001", "Paris", "FR");
+        // Line-level "actual service provider" (autre collectivité)
+        TradeParty actualServiceProvider = new TradeParty("Mairie B", "2 rue B", "69001", "Lyon", "FR");
+        // Buyer
+        TradeParty buyer = new TradeParty("Client X", "3 rue C", "33000", "Bordeaux", "FR");
+
+        Product service = new Product("Prestation", "Service intercommunal", "C62", new BigDecimal("20.00"));
+
+        // Ligne 1 : avec ItemSellerTradeParty
+        Item line1 = new ItemWithItemSellerTradeParty(
+                service,
+                new BigDecimal("100.00"),
+                new BigDecimal("1"),
+                actualServiceProvider
+        );
+
+        // Ligne 2 : sans ItemSellerTradeParty (null via default getter)
+        Item line2 = new Item(
+                service,
+                new BigDecimal("50.00"),
+                new BigDecimal("1")
+        );
+
+        Invoice inv = new Invoice()
+                .setNumber("INV-ITEM-SELLER-001")
+                .setIssueDate(new Date())
+                .setDeliveryDate(new Date())
+                .setDueDate(new Date())
+                .setSender(contractualSeller)
+                .setRecipient(buyer)
+                .setCurrency("EUR")
+                .addItem(line1)
+                .addItem(line2);
+
+        ZUGFeRD2PullProvider provider = new ZUGFeRD2PullProvider();
+        provider.setProfile(Profiles.getByName("EXTENDED"));
+        provider.generateXML(inv);
+
+        String xml = new String(provider.getXML(), StandardCharsets.UTF_8);
+
+        // 1) Le Seller header doit rester "Mairie A"
+        assertThat(xml)
+                .valueByXPath("//*[local-name()='ApplicableHeaderTradeAgreement']" +
+                        "/*[local-name()='SellerTradeParty']" +
+                        "/*[local-name()='Name']")
+                .isEqualTo("Mairie A");
+
+        // 2) Ligne 1 : ItemSellerTradeParty présent, et correspond à "Mairie B"
+        assertThat(xml)
+                .nodesByXPath("(//*[local-name()='IncludedSupplyChainTradeLineItem'])[1]" +
+                        "//*[local-name()='SpecifiedLineTradeAgreement']" +
+                        "/*[local-name()='ItemSellerTradeParty']")
+                .exist();
+
+        assertThat(xml)
+                .valueByXPath("(//*[local-name()='IncludedSupplyChainTradeLineItem'])[1]" +
+                        "//*[local-name()='ItemSellerTradeParty']" +
+                        "/*[local-name()='Name']")
+                .isEqualTo("Mairie B");
+
+         // 3) Ligne 2 : ItemSellerTradeParty absent
+        assertThat(xml)
+                .nodesByXPath("(//*[local-name()='IncludedSupplyChainTradeLineItem'])[2]" +
+                        "//*[local-name()='SpecifiedLineTradeAgreement']" +
+                        "/*[local-name()='ItemSellerTradeParty']").isEmpty();
+     
+    }
+}