diff --git a/properties_pane/field_level/fieldLevelConfig.json b/properties_pane/field_level/fieldLevelConfig.json
index f2d2637..e061f3f 100644
--- a/properties_pane/field_level/fieldLevelConfig.json
+++ b/properties_pane/field_level/fieldLevelConfig.json
@@ -2,9 +2,9 @@
 * Copyright © 2016-2019 by IntegrIT S.A. dba Hackolade.  All rights reserved.
 *
 * The copyright to the computer software herein is the property of IntegrIT S.A.
-* The software may be used and/or copied only with the written permission of 
-* IntegrIT S.A. or in accordance with the terms and conditions stipulated in 
-* the agreement/contract under which the software has been supplied. 
+* The software may be used and/or copied only with the written permission of
+* IntegrIT S.A. or in accordance with the terms and conditions stipulated in
+* the agreement/contract under which the software has been supplied.
 
 
 In order to define custom properties for any object's properties pane, you may copy/paste from the following,
@@ -71,8 +71,8 @@ making sure that you maintain a proper JSON format.
 				]
 			},
 // “groupInput” can have the following states - 0 items, 1 item, and many items.
-// “blockInput” has only 2 states - 0 items or 1 item. 
-// This gives us an easy way to represent it as an object and not as an array internally which is beneficial for processing 
+// “blockInput” has only 2 states - 0 items or 1 item.
+// This gives us an easy way to represent it as an object and not as an array internally which is beneficial for processing
 // and forward-engineering in particular.
 			{
 				"propertyName": "Block",
@@ -100,7 +100,7 @@ making sure that you maintain a proper JSON format.
 				"propertyKeyword": "keyList",
 				"propertyType": "fieldList",
 				"template": "orderedList"
-			}, 
+			},
 			{
 				"propertyName": "List with attribute",
 				"propertyKeyword": "keyListOrder",
@@ -143,8 +143,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",
@@ -515,8 +524,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",
@@ -657,8 +675,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",
@@ -788,8 +815,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",
@@ -874,8 +910,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",
@@ -1015,8 +1060,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",
@@ -1161,8 +1215,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",
@@ -1283,8 +1346,17 @@ making sure that you maintain a proper JSON format.
 					"type": "and",
 					"values": [
 						{
-							"key": "required",
-							"value": false
+							"type": "or",
+							"values": [
+								{
+									"key": "required",
+									"value": false
+								},
+								{
+									"key": "required",
+									"exist": false
+								}
+							]
 						},
 						{
 							"type": "not",