diff --git a/org.adempiere.base/src/org/compiere/model/MMatchPO.java b/org.adempiere.base/src/org/compiere/model/MMatchPO.java
index 4ebaeba4c9..fe8c721b3e 100644
--- a/org.adempiere.base/src/org/compiere/model/MMatchPO.java
+++ b/org.adempiere.base/src/org/compiere/model/MMatchPO.java
@@ -1117,16 +1117,24 @@ public class MMatchPO extends X_M_MatchPO
 				if (validateOrderedQty)
 				{
 					MOrderLine line = new MOrderLine(getCtx(), getC_OrderLine_ID(), get_TrxName());
+					BigDecimal qtyOrdered = line.getQtyOrdered();
 					BigDecimal invoicedQty = DB.getSQLValueBD(get_TrxName(), "SELECT Coalesce(SUM(Qty),0) FROM M_MatchPO WHERE C_InvoiceLine_ID > 0 and C_OrderLine_ID=? AND Reversal_ID IS NULL" , getC_OrderLine_ID());
-					if (invoicedQty != null && invoicedQty.compareTo(line.getQtyOrdered()) > 0)
+					if (    invoicedQty != null
+						&& (   (qtyOrdered.signum() > 0 && invoicedQty.compareTo(qtyOrdered) > 0)
+						    || (qtyOrdered.signum() < 0 && invoicedQty.compareTo(qtyOrdered) < 0)
+						   )
+					   )
 					{
-						throw new IllegalStateException("Total matched invoiced qty > ordered qty. MatchedInvoicedQty="+invoicedQty+", OrderedQty="+line.getQtyOrdered()+", Line="+line);
+						throw new IllegalStateException("Total matched invoiced qty > ordered qty. MatchedInvoicedQty="+invoicedQty+", OrderedQty="+qtyOrdered+", Line="+line);
 					}
-					
 					BigDecimal deliveredQty = DB.getSQLValueBD(get_TrxName(), "SELECT Coalesce(SUM(Qty),0) FROM M_MatchPO WHERE M_InOutLine_ID > 0 and C_OrderLine_ID=? AND Reversal_ID IS NULL" , getC_OrderLine_ID());
-					if (deliveredQty != null && deliveredQty.compareTo(line.getQtyOrdered()) > 0)
+					if (   deliveredQty != null
+						&& (   (qtyOrdered.signum() > 0 && deliveredQty.compareTo(qtyOrdered) > 0)
+						    || (qtyOrdered.signum() < 0 && deliveredQty.compareTo(qtyOrdered) < 0)
+						   )
+					   )
 					{
-						throw new IllegalStateException("Total matched delivered qty > ordered qty. MatchedDeliveredQty="+deliveredQty+", OrderedQty="+line.getQtyOrdered()+", Line="+line);
+						throw new IllegalStateException("Total matched delivered qty > ordered qty. MatchedDeliveredQty="+deliveredQty+", OrderedQty="+qtyOrdered+", Line="+line);
 					}
 				}
 			}
diff --git a/org.idempiere.test/src/org/idempiere/test/model/PurchaseOrderTest.java b/org.idempiere.test/src/org/idempiere/test/model/PurchaseOrderTest.java
new file mode 100644
index 0000000000..d88a65c230
--- /dev/null
+++ b/org.idempiere.test/src/org/idempiere/test/model/PurchaseOrderTest.java
@@ -0,0 +1,116 @@
+/***********************************************************************
+ * This file is part of iDempiere ERP Open Source                      *
+ * http://www.idempiere.org                                            *
+ *                                                                     *
+ * Copyright (C) Contributors                                          *
+ *                                                                     *
+ * This program is free software; you can redistribute it and/or       *
+ * modify it under the terms of the GNU General Public License         *
+ * as published by the Free Software Foundation; either version 2      *
+ * of the License, or (at your option) any later version.              *
+ *                                                                     *
+ * This program is distributed in the hope that it will be useful,     *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of      *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the        *
+ * GNU General Public License for more details.                        *
+ *                                                                     *
+ * You should have received a copy of the GNU General Public License   *
+ * along with this program; if not, write to the Free Software         *
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,          *
+ * MA 02110-1301, USA.                                                 *
+ *                                                                     *
+ * Contributors:                                                       *
+ * - Carlos Ruiz - globalqss	       								   *
+ **********************************************************************/
+package org.idempiere.test.model;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+import java.math.BigDecimal;
+import java.sql.Timestamp;
+import java.util.Properties;
+
+import org.compiere.model.MBPartner;
+import org.compiere.model.MInOut;
+import org.compiere.model.MInOutLine;
+import org.compiere.model.MOrder;
+import org.compiere.model.MOrderLine;
+import org.compiere.model.MProduct;
+import org.compiere.process.DocAction;
+import org.compiere.process.ProcessInfo;
+import org.compiere.util.Env;
+import org.compiere.util.TimeUtil;
+import org.compiere.wf.MWorkflow;
+import org.idempiere.test.AbstractTestCase;
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author Carlos Ruiz - globalqss
+ */
+public class PurchaseOrderTest extends AbstractTestCase {
+
+	public PurchaseOrderTest() {
+	}
+
+	private static final int BP_PATIO = 121;
+	private static final int DOCTYPE_PO = 126;
+	private static final int DOCTYPE_RECEIPT = 122;
+	private static final int PRODUCT_SEEDER = 143;
+	private static final int USER_GARDENADMIN = 101;
+
+	/**
+	 * https://idempiere.atlassian.net/browse/IDEMPIERE-4575
+	 */
+	@Test
+	public void testQtyReservedForNegativeOrderAndReceipt() {
+		Properties ctx = Env.getCtx();
+		String trxName = getTrxName();
+
+		MOrder order = new MOrder(ctx, 0, trxName);
+		order.setBPartner(MBPartner.get(ctx, BP_PATIO));
+		order.setC_DocTypeTarget_ID(DOCTYPE_PO);
+		order.setIsSOTrx(false);
+		order.setSalesRep_ID(USER_GARDENADMIN);
+		order.setDocStatus(DocAction.STATUS_Drafted);
+		order.setDocAction(DocAction.ACTION_Complete);
+		Timestamp today = TimeUtil.getDay(System.currentTimeMillis());
+		order.setDateOrdered(today);
+		order.setDatePromised(today);
+		order.saveEx();
+
+		MOrderLine line1 = new MOrderLine(order);
+		line1.setLine(10);
+		line1.setProduct(MProduct.get(ctx, PRODUCT_SEEDER));
+		line1.setQty(new BigDecimal("-1"));
+		line1.setDatePromised(today);
+		line1.saveEx();
+
+		ProcessInfo info = MWorkflow.runDocumentActionWorkflow(order, DocAction.ACTION_Complete);
+		assertFalse(info.isError());
+		order.load(trxName);		
+		assertEquals(DocAction.STATUS_Completed, order.getDocStatus());
+		line1.load(trxName);
+		assertEquals(0, line1.getQtyReserved().intValue());
+
+		MInOut receipt = new MInOut(order, DOCTYPE_RECEIPT, order.getDateOrdered());
+		receipt.setDocStatus(DocAction.STATUS_Drafted);
+		receipt.setDocAction(DocAction.ACTION_Complete);
+		receipt.saveEx();
+
+		// negative receipt
+		MInOutLine receiptLine = new MInOutLine(receipt);
+		receiptLine.setOrderLine(line1, 0, new BigDecimal("-1"));
+		receiptLine.setQty(new BigDecimal("-1"));
+		receiptLine.saveEx();
+
+		info = MWorkflow.runDocumentActionWorkflow(receipt, DocAction.ACTION_Complete);
+		assertFalse(info.isError());
+		receipt.load(trxName);
+		assertEquals(DocAction.STATUS_Completed, receipt.getDocStatus());
+
+		line1.load(trxName);
+		assertEquals(0, line1.getQtyReserved().intValue());		
+	}
+
+}