diff --git a/org.adempiere.base.process/src/org/compiere/process/ImportInventory.java b/org.adempiere.base.process/src/org/compiere/process/ImportInventory.java
index 9f0beb837b..c7378bbc11 100644
--- a/org.adempiere.base.process/src/org/compiere/process/ImportInventory.java
+++ b/org.adempiere.base.process/src/org/compiere/process/ImportInventory.java
@@ -298,7 +298,7 @@ public class ImportInventory extends SvrProcess
 
 				//	Line
 				int M_AttributeSetInstance_ID = 0;
-				if (imp.getLot() != null || imp.getSerNo() != null)
+				if ((imp.getLot() != null && imp.getLot().length() > 0) || (imp.getSerNo() != null && imp.getSerNo().length() > 0))
 				{
 					MProduct product = MProduct.get(getCtx(), imp.getM_Product_ID());
 					if (product.isInstanceAttribute())