diff --git a/test/LearningTest/TestKhiops/Standard/BUGIrisU/IrisExtended.kdic b/test/LearningTest/TestKhiops/Standard/BUGIrisU/IrisExtended.kdic
new file mode 100644
index 000000000..f264f98f0
--- /dev/null
+++ b/test/LearningTest/TestKhiops/Standard/BUGIrisU/IrisExtended.kdic
@@ -0,0 +1,11 @@
+#Khiops 7.7.2i
+
+Dictionary	Iris
+{
+Unused	Numerical	SepalLength		;	
+	Numerical	SepalWidth		;	
+Unused	Numerical	PetalLength		;	
+Unused	Numerical	PetalWidth		;	
+	Categorical	SPetalLength	 = AsCategorical(Floor(PetalLength))	;	
+Unused	Categorical	Class		;	
+};
diff --git a/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/AllReports.khj b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/AllReports.khj
new file mode 100644
index 000000000..9b9e4dd49
--- /dev/null
+++ b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/AllReports.khj
@@ -0,0 +1,198 @@
+{
+	"tool": "Khiops",
+	"version": "10.2.0",
+	"shortDescription": "",
+	"preparationReport": {
+		"reportType": "Preparation",
+		"summary": {
+			"dictionary": "Iris",
+			"variables": {
+				"types": [
+					"Categorical",
+					"Numerical"
+				],
+				"numbers": [
+					1,
+					1
+				]
+			},
+			"database": "..\/..\/..\/datasets\/Iris\/Iris.txt",
+			"samplePercentage": 70,
+			"samplingMode": "Include sample",
+			"selectionVariable": "",
+			"selectionValue": "",
+			"instances": 105,
+			"learningTask": "Unsupervised analysis",
+			"evaluatedVariables": 2,
+			"nativeVariables": 1,
+			"constructedVariables": 1,
+			"featureEngineering": {
+				"maxNumberOfConstructedVariables": 0,
+				"maxNumberOfTrees": 0,
+				"maxNumberOfVariablePairs": 100
+			},
+			"discretization": "EqualWidth",
+			"valueGrouping": "BasicGrouping"
+		},
+		"variablesStatistics": [
+			{
+				"rank": "R1",
+				"name": "SPetalLength",
+				"type": "Categorical",
+				"values": 5,
+				"mode": "1",
+				"modeFrequency": 38,
+				"constructionCost": 1.38629,
+				"derivationRule": "AsCategorical(Floor(PetalLength))"
+			},
+			{
+				"rank": "R2",
+				"name": "SepalWidth",
+				"type": "Numerical",
+				"values": 23,
+				"min": 2,
+				"max": 4.4,
+				"mean": 3.081904762,
+				"stdDev": 0.4284592446,
+				"missingNumber": 0,
+				"constructionCost": 1.38629
+			}
+		],
+		"variablesDetailedStatistics": {
+			"R1": {
+				"dataGrid": {
+					"isSupervised": false,
+					"dimensions": [
+						{
+							"variable": "SPetalLength",
+							"type": "Categorical",
+							"partitionType": "Value groups",
+							"partition": [
+								["1"],
+								["5"],
+								["4"],
+								["3"],
+								["6"]
+							],
+							"defaultGroupIndex": 4
+						}
+					],
+					"frequencies": [38,27,25,8,7]
+				},
+				"inputValues": {
+					"values": ["1","5","4","3","6"],
+					"frequencies": [38,27,25,8,7]
+				}
+			},
+			"R2": {
+				"dataGrid": {
+					"isSupervised": false,
+					"dimensions": [
+						{
+							"variable": "SepalWidth",
+							"type": "Numerical",
+							"partitionType": "Intervals",
+							"partition": [
+								[2,2.25],
+								[2.25,2.45],
+								[2.45,2.75],
+								[2.75,2.95],
+								[2.95,3.25],
+								[3.25,3.45],
+								[3.45,3.65],
+								[3.65,3.95],
+								[3.95,4.15],
+								[4.15,4.4]
+							]
+						}
+					],
+					"frequencies": [2,3,14,17,41,12,5,7,2,2]
+				}
+			}
+		}
+	},
+	"bivariatePreparationReport": {
+		"reportType": "BivariatePreparation",
+		"summary": {
+			"dictionary": "Iris",
+			"variables": {
+				"types": [
+					"Categorical",
+					"Numerical"
+				],
+				"numbers": [
+					1,
+					1
+				]
+			},
+			"database": "..\/..\/..\/datasets\/Iris\/Iris.txt",
+			"samplePercentage": 70,
+			"samplingMode": "Include sample",
+			"selectionVariable": "",
+			"selectionValue": "",
+			"instances": 105,
+			"learningTask": "Unsupervised analysis",
+			"evaluatedVariablePairs": 1,
+			"informativeVariablePairs": 1
+		},
+		"variablesPairsStatistics": [
+			{
+				"rank": "R1",
+				"name1": "SPetalLength",
+				"name2": "SepalWidth",
+				"level": 0.0103105,
+				"variables": 2,
+				"parts1": 3,
+				"parts2": 3,
+				"cells": 9,
+				"constructionCost": 3.13205,
+				"preparationCost": 38.9735,
+				"dataCost": 497.662
+			}
+		],
+		"variablesPairsDetailedStatistics": {
+			"R1": {
+				"dataGrid": {
+					"isSupervised": false,
+					"dimensions": [
+						{
+							"variable": "SPetalLength",
+							"type": "Categorical",
+							"partitionType": "Value groups",
+							"partition": [
+								["4"],
+								["1"],
+								["5"]
+							],
+							"defaultGroupIndex": 0
+						},
+						{
+							"variable": "SepalWidth",
+							"type": "Numerical",
+							"partitionType": "Intervals",
+							"partition": [
+								[2,2.95],
+								[2.95,3.25],
+								[3.25,4.4]
+							]
+						}
+					],
+					"cellIds": ["C1","C2","C3","C4","C5","C6","C7","C8","C9"],
+					"cellPartIndexes": [
+						[0,0],
+						[1,0],
+						[2,0],
+						[0,1],
+						[1,1],
+						[2,1],
+						[0,2],
+						[1,2],
+						[2,2]
+					],
+					"cellFrequencies": [26,1,9,10,15,16,4,22,2]
+				}
+			}
+		}
+	},
+	"khiops_encoding": "ascii"
+}
diff --git a/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/PreparationReport.xls b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/PreparationReport.xls
new file mode 100644
index 000000000..8d32e583f
--- /dev/null
+++ b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/PreparationReport.xls
@@ -0,0 +1,87 @@
+#Khiops 10.2.0
+Descriptive statistics
+
+
+Problem description
+Short description	
+
+Dictionary	Iris
+Variables
+	Categorical	1
+	Numerical	1
+	Total	2
+
+Database	../../../datasets/Iris/Iris.txt
+Sample percentage	70
+Sampling mode	Include sample
+Selection variable	
+Selection value	
+Instances	105
+
+Learning task	Unsupervised analysis
+
+Evaluated variables	2
+Native variables	1
+Constructed variables	1
+
+Max number of constructed variables	0
+Max number of trees	0
+Max number of variable pairs	100
+Discretization	EqualWidth
+Value grouping	BasicGrouping
+
+
+Categorical variables statistics
+
+Rank	Name	Values	Mode	Mode coverage	Constr. cost	Derivation rule
+R1	SPetalLength	5	1	0.361905	1.38629	AsCategorical(Floor(PetalLength))
+
+
+Numerical variables statistics
+
+Rank	Name	Values	Min	Max	Mean	Std dev	Missing number	Constr. cost	Derivation rule
+R2	SepalWidth	23	2	4.4	3.081904762	0.4284592446	0	1.38629
+
+
+--------------------------------------------------------------------------------
+
+Variables detailed statistics
+
+
+Rank	R1
+Variable	Categorical	SPetalLength
+
+Variable stats
+Group	Frequency	Coverage	Size	Value list
+{1}	38	0.361905	1	1
+{5}	27	0.257143	1	5
+{4}	25	0.238095	1	4
+{3}	8	0.0761905	1	3
+{6}	7	0.0666667	1	6	 * 
+
+
+Values
+Value	Frequency	Coverage
+1	38	0.361905
+5	27	0.257143
+4	25	0.238095
+3	8	0.0761905
+6	7	0.0666667
+
+----------------------------------------------
+Rank	R2
+Variable	Numerical	SepalWidth
+
+Variable stats
+Interval	Frequency	Coverage
+]-inf;2.25]	2	0.0190476
+]2.25;2.45]	3	0.0285714
+]2.45;2.75]	14	0.133333
+]2.75;2.95]	17	0.161905
+]2.95;3.25]	41	0.390476
+]3.25;3.45]	12	0.114286
+]3.45;3.65]	5	0.047619
+]3.65;3.95]	7	0.0666667
+]3.95;4.15]	2	0.0190476
+]4.15;+inf[	2	0.0190476
+
diff --git a/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/PreparationReport2D.xls b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/PreparationReport2D.xls
new file mode 100644
index 000000000..18ab5e43f
--- /dev/null
+++ b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/PreparationReport2D.xls
@@ -0,0 +1,77 @@
+#Khiops 10.2.0
+Descriptive statistics
+
+
+Problem description
+Short description	
+
+Dictionary	Iris
+Variables
+	Categorical	1
+	Numerical	1
+	Total	2
+
+Database	../../../datasets/Iris/Iris.txt
+Sample percentage	70
+Sampling mode	Include sample
+Selection variable	
+Selection value	
+Instances	105
+
+Learning task	Unsupervised analysis
+
+Evaluated variable pairs	1
+Informative variable pairs	1
+
+
+Variables pairs statistics
+
+Rank	Name 1	Name 2	Level	Variables	Parts 1	Parts 2	Cells	Constr. cost	Prep. cost	Data cost
+R1	SPetalLength	SepalWidth	0.0103105	2	3	3	9	3.13205	38.9735	497.662
+
+
+--------------------------------------------------------------------------------
+
+Variables pairs detailed statistics
+(Pairs with two jointly informative variables)
+
+
+Rank	R1
+Variables
+	Type	Name
+	Categorical	SPetalLength
+	Numerical	SepalWidth
+
+Variables stats
+SPetalLength
+Group	Frequency	Coverage	Size	Value list
+{4}	40	0.380952	3	4	 * 
+{1}	38	0.361905	1	1
+{5}	27	0.257143	1	5
+SepalWidth
+Interval	Frequency	Coverage
+]-inf;2.95]	36	0.342857
+]2.95;3.25]	41	0.390476
+]3.25;+inf[	28	0.266667
+
+Cell frequencies
+	SepalWidth
+SPetalLength	]-inf;2.95]	]2.95;3.25]	]3.25;+inf[	Total	Coverage
+{4}	26	10	4	40	0.380952
+{1}	1	15	22	38	0.361905
+{5}	9	16	2	27	0.257143
+Total	36	41	28	105
+Coverage	0.342857	0.390476	0.266667
+
+Cells	9
+Cell Id	SPetalLength	SepalWidth	Frequency	Coverage
+C1	{4}	]-inf;2.95]	26	0.247619
+C8	{1}	]3.25;+inf[	22	0.209524
+C6	{5}	]2.95;3.25]	16	0.152381
+C5	{1}	]2.95;3.25]	15	0.142857
+C4	{4}	]2.95;3.25]	10	0.0952381
+C3	{5}	]-inf;2.95]	9	0.0857143
+C7	{4}	]3.25;+inf[	4	0.0380952
+C9	{5}	]3.25;+inf[	2	0.0190476
+C2	{1}	]-inf;2.95]	1	0.00952381
+	Total		105	1
diff --git a/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/err.txt b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/err.txt
new file mode 100644
index 000000000..6c4f3d81d
--- /dev/null
+++ b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/err.txt
@@ -0,0 +1,6 @@
+Train unsupervised model
+Database ../../../datasets/Iris/Iris.txt: Read records: 150	Selected records: 105
+Evaluation of variable pairs
+Data preparation time: 0:00:00.07
+Write report ./results\AllReports.khj
+
diff --git a/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/time.log b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/time.log
new file mode 100644
index 000000000..514a4afeb
--- /dev/null
+++ b/test/LearningTest/TestKhiops/Standard/BUGIrisU/results.ref/time.log
@@ -0,0 +1 @@
+Overal time: 0.4408118724822998
diff --git a/test/LearningTest/TestKhiops/Standard/BUGIrisU/test.prm b/test/LearningTest/TestKhiops/Standard/BUGIrisU/test.prm
new file mode 100644
index 000000000..98fcd668b
--- /dev/null
+++ b/test/LearningTest/TestKhiops/Standard/BUGIrisU/test.prm
@@ -0,0 +1,54 @@
+// Thu Jun 12 13:31:06 2008
+// modl
+// Output command file
+//
+//This file contains recorded commands, that can be replayed.
+//Commands are based on user interactions:
+//	field update
+//	list index selection
+//	menu action
+//Every command can be commented, using //.
+//For example, commenting the last Exit command will allow other
+//user interactions, after the commands have been replayed.
+//
+//
+
+// -> Data preparation and scoring
+ClassManagement.OpenFile       // Open...
+
+// -> Open
+ClassFileName ../../../datasets/Iris/Iris.kdic       // Dictionary file
+ClassFileName ./IrisExtended.kdic       // Dictionary file
+OK                             // Open
+// <- Open
+
+ClassManagement.ClassName Iris          // Dictionary
+
+TrainDatabase.DatabaseFiles.List.Key Iris               // List item selection
+TrainDatabase.DatabaseFiles.DataTableName ../../../datasets/Iris/Iris.txt     // Database file
+TrainDatabase.SampleNumberPercentage 70  // Sample percentage
+
+
+AnalysisSpec.TargetAttributeName    // Target variable
+
+AnalysisSpec.PredictorsSpec.SelectiveNaiveBayesPredictor false // Predicteur Bayesien Naif Selectif
+
+AnalysisSpec.PredictorsSpec.ConstructionSpec.MaxAttributePairNumber 100    // Max number of pairs of variables
+
+AnalysisResults.ResultFilesDirectory ./results   // Result files directory
+AnalysisResults.Preparation2DFileName PreparationReport2D.xls     // Preparation report
+
+
+
+AnalysisSpec.PredictorsSpec.ConstructionSpec.MaxTreeNumber 0  // Max Tree number
+AnalysisSpec.PredictorsSpec.ConstructionSpec.MaxConstructedAttributeNumber 0 // Max number of constructed variables
+ComputeStats                   // Analyse database
+
+Exit                           // Close
+// <- Data preparation and scoring
+
+
+// -> Data preparation and scoring
+OK                             // Close
+// <- Data preparation and scoring
+