diff --git a/forward_engineering/ddlProvider.js b/forward_engineering/ddlProvider.js
index ccbc0e6..01a8bad 100644
--- a/forward_engineering/ddlProvider.js
+++ b/forward_engineering/ddlProvider.js
@@ -26,15 +26,20 @@ module.exports = (baseProvider, options, app) => {
 		divideIntoActivatedAndDeactivated,
 		commentIfDeactivated,
 	});
-	const { generateConstraintsString, foreignKeysToString, foreignActiveKeysToString, createKeyConstraint } =
-		require('./helpers/constraintsHelper')({
-			_,
-			commentIfDeactivated,
-			checkAllKeysDeactivated,
-			assignTemplates,
-			getColumnsList,
-			wrapInQuotes,
-		});
+	const {
+		generateConstraintsString,
+		foreignKeysToString,
+		foreignActiveKeysToString,
+		createKeyConstraint,
+		getConstraintsWarnings,
+	} = require('./helpers/constraintsHelper')({
+		_,
+		commentIfDeactivated,
+		checkAllKeysDeactivated,
+		assignTemplates,
+		getColumnsList,
+		wrapInQuotes,
+	});
 	const keyHelper = require('./helpers/keyHelper')(_, clean);
 
 	const { getFunctionsScript } = require('./helpers/functionHelper')({
@@ -175,10 +180,18 @@ module.exports = (baseProvider, options, app) => {
 			});
 
 			const dividedKeysConstraints = divideIntoActivatedAndDeactivated(
-				keyConstraints.map(createKeyConstraint(templates, isActivated)),
+				keyConstraints
+					.filter(({ errorMessage }) => !errorMessage)
+					.map(createKeyConstraint(templates, isActivated)),
 				key => key.statement,
 			);
-			const keyConstraintsString = generateConstraintsString(dividedKeysConstraints, isActivated);
+			const constraintWarnings = getConstraintsWarnings(
+				keyConstraints.filter(({ errorMessage }) => errorMessage),
+			);
+			const keyConstraintsString = `${generateConstraintsString(
+				dividedKeysConstraints,
+				isActivated,
+			)}\n\t${constraintWarnings}`;
 			const keyConstraintsValue = partitionOf ? keyConstraintsString?.slice(1) : keyConstraintsString;
 
 			const dividedForeignKeys = divideIntoActivatedAndDeactivated(foreignKeyConstraints, key => key.statement);
@@ -531,7 +544,7 @@ module.exports = (baseProvider, options, app) => {
 			}
 
 			jsonSchema = _.omit(jsonSchema, '$ref');
-			return  { ...definitionJsonSchema, ...jsonSchema };
+			return { ...definitionJsonSchema, ...jsonSchema };
 		},
 
 		hydrateIndex(indexData, tableData, schemaData) {
diff --git a/forward_engineering/helpers/constraintsHelper.js b/forward_engineering/helpers/constraintsHelper.js
index 5a3d5f7..636e3f9 100644
--- a/forward_engineering/helpers/constraintsHelper.js
+++ b/forward_engineering/helpers/constraintsHelper.js
@@ -69,10 +69,21 @@ module.exports = ({
 		};
 	};
 
+	const getConstraintsWarnings = (invalidConstraints = []) => {
+		return invalidConstraints
+			.map(keyData => {
+				const constraintName = keyData.name ? ` [constraint name: ${keyData.name}]` : '';
+
+				return `-- ${keyData.errorMessage}${constraintName}`;
+			})
+			.join('\n\t');
+	};
+
 	return {
 		generateConstraintsString,
 		foreignKeysToString,
 		foreignActiveKeysToString,
 		createKeyConstraint,
+		getConstraintsWarnings,
 	};
 };
diff --git a/forward_engineering/helpers/keyHelper.js b/forward_engineering/helpers/keyHelper.js
index fe3e623..e5a4199 100644
--- a/forward_engineering/helpers/keyHelper.js
+++ b/forward_engineering/helpers/keyHelper.js
@@ -91,12 +91,17 @@ module.exports = (_, clean) => {
 			return [];
 		}
 
-		return jsonSchema.primaryKey
-			.filter(primaryKey => !_.isEmpty(primaryKey.compositePrimaryKey))
-			.map(primaryKey => ({
-				...hydratePrimaryKeyOptions(primaryKey, null, null, jsonSchema),
-				columns: getKeys(primaryKey.compositePrimaryKey, jsonSchema),
-			}));
+		return jsonSchema.primaryKey.map(primaryKey =>
+			!_.isEmpty(primaryKey.compositePrimaryKey)
+				? {
+						...hydratePrimaryKeyOptions(primaryKey, null, null, jsonSchema),
+						columns: getKeys(primaryKey.compositePrimaryKey, jsonSchema),
+				  }
+				: {
+						name: primaryKey.constraintName,
+						errorMessage: 'A primary key constraint cannot be created without any primary key selected',
+				  },
+		);
 	};
 
 	const getCompositeUniqueKeys = jsonSchema => {
@@ -104,12 +109,17 @@ module.exports = (_, clean) => {
 			return [];
 		}
 
-		return jsonSchema.uniqueKey
-			.filter(uniqueKey => !_.isEmpty(uniqueKey.compositeUniqueKey))
-			.map(uniqueKey => ({
-				...hydrateUniqueOptions(uniqueKey, null, null, jsonSchema),
-				columns: getKeys(uniqueKey.compositeUniqueKey, jsonSchema),
-			}));
+		return jsonSchema.uniqueKey.map(uniqueKey =>
+			!_.isEmpty(uniqueKey.compositeUniqueKey)
+				? {
+						...hydrateUniqueOptions(uniqueKey, null, null, jsonSchema),
+						columns: getKeys(uniqueKey.compositeUniqueKey, jsonSchema),
+				  }
+				: {
+						name: uniqueKey.constraintName,
+						errorMessage: 'A unique key constraint cannot be created without any unique key selected',
+				  },
+		);
 	};
 
 	const getTableKeyConstraints = jsonSchema => {
diff --git a/properties_pane/entity_level/entityLevelConfig.json b/properties_pane/entity_level/entityLevelConfig.json
index 2b68438..4b220a0 100644
--- a/properties_pane/entity_level/entityLevelConfig.json
+++ b/properties_pane/entity_level/entityLevelConfig.json
@@ -675,12 +675,17 @@ making sure that you maintain a proper JSON format.
 						"propertyName": "Constraint name",
 						"propertyKeyword": "constraintName",
 						"propertyTooltip": "",
-						"propertyType": "text"
+						"propertyType": "text",
+						"validation": {
+							"indexKey": "compositePrimaryKey",
+							"message": "A primary key constraint cannot be created without any primary key selected"
+						}
 					},
 					{
 						"propertyName": "Key",
 						"propertyKeyword": "compositePrimaryKey",
 						"propertyType": "primaryKeySetter",
+						"requiredProperty": true,
 						"abbr": "pk"
 					},
 					{
@@ -764,12 +769,17 @@ making sure that you maintain a proper JSON format.
 						"propertyName": "Constraint name",
 						"propertyKeyword": "constraintName",
 						"propertyTooltip": "",
-						"propertyType": "text"
+						"propertyType": "text",
+						"validation": {
+							"indexKey": "compositeUniqueKey",
+							"message": "A unique key constraint cannot be created without any unique key selected"
+						}
 					},
 					{
 						"propertyName": "Key",
 						"propertyKeyword": "compositeUniqueKey",
 						"propertyType": "primaryKeySetter",
+						"requiredProperty": true,
 						"abbr": "uk"
 					},
 					{