Fix a generation tool bug.
diff --git a/oal-parser/src/main/java/org/apache/skywalking/oal/tool/parser/SourceColumnsFactory.java b/oal-parser/src/main/java/org/apache/skywalking/oal/tool/parser/SourceColumnsFactory.java
index 450c211..578963c 100644
--- a/oal-parser/src/main/java/org/apache/skywalking/oal/tool/parser/SourceColumnsFactory.java
+++ b/oal-parser/src/main/java/org/apache/skywalking/oal/tool/parser/SourceColumnsFactory.java
@@ -64,7 +64,7 @@
                 return columnList;
             case "ServiceRelation":
                 columnList = new LinkedList<>();
-                SourceColumn sourceService = new SourceColumn("entityId", "source_service_id", String.class, true);
+                SourceColumn sourceService = new SourceColumn("entityId", "entity_id", String.class, true);
                 columnList.add(sourceService);
                 return columnList;
             case "ServiceInstanceRelation":