diff --git a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicFormReport.cs b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicFormReport.cs
index 7954a87..b7873a1 100644
--- a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicFormReport.cs
+++ b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicFormReport.cs
@@ -686,15 +686,16 @@ public class DynamicFormReport : XtraReport
     {
         var bindingName = DynamicReportImageHelper.GetReportFieldName(selectField);
         var lookup = DynamicReportImageHelper.GetLookup(field);
+        var isMultiValue = IsMultiValueLookupEditor(editorType);
 
         if (lookup == null || selectField?.JoinOptions != null)
         {
-            return new FormReportField(field, bindingName, editorType, columnSpan, null, null, DynamicReportImageHelper.IsImageEditor(editorType));
+            return new FormReportField(field, bindingName, editorType, columnSpan, null, null, isMultiValue, DynamicReportImageHelper.IsImageEditor(editorType));
         }
 
         if (DynamicReportSqlBuilder.IsReportQueryableLookup(lookup))
         {
-            return new FormReportField(field, DynamicReportSqlBuilder.GetLookupBindingName(field), editorType, columnSpan, lookup, null, false);
+            return new FormReportField(field, DynamicReportSqlBuilder.GetLookupBindingName(field), editorType, columnSpan, lookup, null, isMultiValue, false);
         }
 
         if (lookup.DataSourceType == UiLookupDataSourceTypeEnum.StaticData)
@@ -707,10 +708,16 @@ public class DynamicFormReport : XtraReport
                 columnSpan,
                 lookup,
                 staticLookupValues,
+                isMultiValue,
                 false);
         }
 
-        return new FormReportField(field, bindingName, editorType, columnSpan, null, null, DynamicReportImageHelper.IsImageEditor(editorType));
+        return new FormReportField(field, bindingName, editorType, columnSpan, null, null, isMultiValue, DynamicReportImageHelper.IsImageEditor(editorType));
+    }
+
+    private static bool IsMultiValueLookupEditor(string editorType)
+    {
+        return editorType is PlatformConsts.EditorTypes.dxTagBox or "dxGridBox";
     }
 
     private static string CreateKeyFilter(string keyFieldName, string id)
@@ -749,5 +756,6 @@ public class DynamicFormReport : XtraReport
         int ColumnSpan,
         LookupDto Lookup,
         Dictionary<string, string> StaticLookupValues,
+        bool IsMultiValue,
         bool IsImage) : DynamicReportSqlBuilder.IReportLookupColumn;
 }
diff --git a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicGridReport.cs b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicGridReport.cs
index 26174fc..a6213b8 100644
--- a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicGridReport.cs
+++ b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicGridReport.cs
@@ -567,15 +567,16 @@ public class DynamicGridReport : XtraReport
     {
         var bindingName = DynamicReportImageHelper.GetReportFieldName(selectField);
         var lookup = DynamicReportImageHelper.GetLookup(field);
+        var isMultiValue = IsMultiValueLookupEditor(editorType);
 
         if (lookup == null || selectField?.JoinOptions != null)
         {
-            return new ReportColumn(field, bindingName, null, null, isImage, isHtml, editorType);
+            return new ReportColumn(field, bindingName, null, null, isMultiValue, isImage, isHtml, editorType);
         }
 
         if (DynamicReportSqlBuilder.IsReportQueryableLookup(lookup))
         {
-            return new ReportColumn(field, DynamicReportSqlBuilder.GetLookupBindingName(field), lookup, null, isImage, isHtml, editorType);
+            return new ReportColumn(field, DynamicReportSqlBuilder.GetLookupBindingName(field), lookup, null, isMultiValue, isImage, isHtml, editorType);
         }
 
         if (lookup.DataSourceType == UiLookupDataSourceTypeEnum.StaticData)
@@ -586,12 +587,18 @@ public class DynamicGridReport : XtraReport
                 staticLookupValues?.Count > 0 ? DynamicReportSqlBuilder.GetLookupBindingName(field) : bindingName,
                 lookup,
                 staticLookupValues,
+                isMultiValue,
                 isImage,
                 isHtml,
                 editorType);
         }
 
-        return new ReportColumn(field, bindingName, null, null, isImage, isHtml, editorType);
+        return new ReportColumn(field, bindingName, null, null, isMultiValue, isImage, isHtml, editorType);
+    }
+
+    private static bool IsMultiValueLookupEditor(string editorType)
+    {
+        return editorType is PlatformConsts.EditorTypes.dxTagBox or "dxGridBox";
     }
 
     private sealed record ReportColumn(
@@ -599,6 +606,7 @@ public class DynamicGridReport : XtraReport
         string BindingName,
         LookupDto Lookup,
         Dictionary<string, string> StaticLookupValues,
+        bool IsMultiValue,
         bool IsImage,
         bool IsHtml,
         string EditorType,
diff --git a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicReportSqlBuilder.cs b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicReportSqlBuilder.cs
index 2785006..6a4656f 100644
--- a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicReportSqlBuilder.cs
+++ b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicReportSqlBuilder.cs
@@ -25,6 +25,7 @@ internal static class DynamicReportSqlBuilder
         string BindingName { get; }
         LookupDto Lookup { get; }
         Dictionary<string, string> StaticLookupValues { get; }
+        bool IsMultiValue { get; }
     }
 
     internal static string GetLookupBindingName(ListFormField field)
@@ -92,6 +93,11 @@ internal static class DynamicReportSqlBuilder
         IReportLookupColumn column,
         DataSourceTypeEnum dataSourceType)
     {
+        if (column.IsMultiValue)
+        {
+            return CreateStaticMultiLookupSelectPart(column, dataSourceType);
+        }
+
         var sourceField = GetSourceField(column.Field.FieldName);
         var cases = column.StaticLookupValues
             .Select(item => $"WHEN {DynamicReportImageHelper.ToSqlLiteral(item.Key, dataSourceType)} THEN {DynamicReportImageHelper.ToSqlLiteral(item.Value, dataSourceType)}");
@@ -110,6 +116,11 @@ internal static class DynamicReportSqlBuilder
             return null;
         }
 
+        if (column.IsMultiValue)
+        {
+            return CreateQueryMultiLookupSelectPart(column, lookupQuery, dataSourceType);
+        }
+
         var lookupAlias = QuoteSqlIdentifier(LookupAlias);
         var valueExpr = QuoteSqlIdentifier(column.Lookup.ValueExpr ?? "Key");
         var displayExpr = QuoteSqlIdentifier(column.Lookup.DisplayExpr ?? "Name");
@@ -123,6 +134,65 @@ internal static class DynamicReportSqlBuilder
         return $"({scalarQuery}) AS {resultAlias}";
     }
 
+    private static string CreateStaticMultiLookupSelectPart(
+        IReportLookupColumn column,
+        DataSourceTypeEnum dataSourceType)
+    {
+        var sourceField = GetSourceField(column.Field.FieldName);
+        var resultAlias = QuoteSqlIdentifier(column.BindingName);
+        var values = string.Join(
+            ", ",
+            column.StaticLookupValues.Select(item =>
+                $"({DynamicReportImageHelper.ToSqlLiteral(item.Key, dataSourceType)}, {DynamicReportImageHelper.ToSqlLiteral(item.Value, dataSourceType)})"));
+
+        if (dataSourceType == DataSourceTypeEnum.Mssql)
+        {
+            return $"""
+                (SELECT STRING_AGG(CAST({LookupAliasForValues()}.DisplayValue AS NVARCHAR(MAX)), N', ')
+                 FROM (VALUES {values}) AS {LookupAliasForValues()}(ValueKey, DisplayValue)
+                 INNER JOIN STRING_SPLIT(CAST({sourceField} AS NVARCHAR(MAX)), N'{PlatformConsts.MultiValueDelimiter}') AS SplitValues
+                    ON CAST({LookupAliasForValues()}.ValueKey AS NVARCHAR(4000)) = LTRIM(RTRIM(SplitValues.value))) AS {resultAlias}
+                """.ReplaceLineEndings(" ").Trim();
+        }
+
+        return $"""
+            (SELECT string_agg(CAST({LookupAliasForValues()}."DisplayValue" AS TEXT), ', ')
+             FROM (VALUES {values}) AS {LookupAliasForValues()}("ValueKey", "DisplayValue")
+             INNER JOIN unnest(string_to_array(CAST({sourceField} AS TEXT), '{PlatformConsts.MultiValueDelimiter}')) AS SplitValues(value)
+                ON CAST({LookupAliasForValues()}."ValueKey" AS TEXT) = btrim(SplitValues.value)) AS {resultAlias}
+            """.ReplaceLineEndings(" ").Trim();
+    }
+
+    private static string CreateQueryMultiLookupSelectPart(
+        IReportLookupColumn column,
+        string lookupQuery,
+        DataSourceTypeEnum dataSourceType)
+    {
+        var lookupAlias = QuoteSqlIdentifier(LookupAlias);
+        var valueExpr = QuoteSqlIdentifier(column.Lookup.ValueExpr ?? "Key");
+        var displayExpr = QuoteSqlIdentifier(column.Lookup.DisplayExpr ?? "Name");
+        var sourceField = GetSourceField(column.Field.FieldName);
+        var resultAlias = QuoteSqlIdentifier(column.BindingName);
+
+        var scalarQuery = dataSourceType == DataSourceTypeEnum.Mssql
+            ? $"""
+                SELECT STRING_AGG(CAST({lookupAlias}.{displayExpr} AS NVARCHAR(MAX)), N', ')
+                FROM ({lookupQuery}) AS {lookupAlias}
+                INNER JOIN STRING_SPLIT(CAST({sourceField} AS NVARCHAR(MAX)), N'{PlatformConsts.MultiValueDelimiter}') AS SplitValues
+                   ON CAST({lookupAlias}.{valueExpr} AS NVARCHAR(4000)) = LTRIM(RTRIM(SplitValues.value))
+                """.ReplaceLineEndings(" ").Trim()
+            : $"""
+                SELECT string_agg(CAST({lookupAlias}.{displayExpr} AS TEXT), ', ')
+                FROM ({lookupQuery}) AS {lookupAlias}
+                INNER JOIN unnest(string_to_array(CAST({sourceField} AS TEXT), '{PlatformConsts.MultiValueDelimiter}')) AS SplitValues(value)
+                   ON CAST({lookupAlias}.{valueExpr} AS TEXT) = btrim(SplitValues.value)
+                """.ReplaceLineEndings(" ").Trim();
+
+        return $"({scalarQuery}) AS {resultAlias}";
+    }
+
+    private static string LookupAliasForValues() => "LookupValues";
+
     private static string GetSourceField(string fieldName)
     {
         return $"{QuoteSqlIdentifier(SourceAlias)}.{QuoteSqlIdentifier(fieldName)}";
diff --git a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicTreeReport.cs b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicTreeReport.cs
index d76fd68..7ac7ab5 100644
--- a/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicTreeReport.cs
+++ b/api/src/Sozsoft.Platform.HttpApi.Host/PredefinedReports/DynamicTreeReport.cs
@@ -715,15 +715,16 @@ public class DynamicTreeReport : XtraReport
     {
         var bindingName = DynamicReportImageHelper.GetReportFieldName(selectField);
         var lookup = DynamicReportImageHelper.GetLookup(field);
+        var isMultiValue = IsMultiValueLookupEditor(editorType);
 
         if (lookup == null || selectField?.JoinOptions != null)
         {
-            return new ReportColumn(field, bindingName, null, null, isImage, isHtml, editorType);
+            return new ReportColumn(field, bindingName, null, null, isMultiValue, isImage, isHtml, editorType);
         }
 
         if (DynamicReportSqlBuilder.IsReportQueryableLookup(lookup))
         {
-            return new ReportColumn(field, DynamicReportSqlBuilder.GetLookupBindingName(field), lookup, null, isImage, isHtml, editorType);
+            return new ReportColumn(field, DynamicReportSqlBuilder.GetLookupBindingName(field), lookup, null, isMultiValue, isImage, isHtml, editorType);
         }
 
         if (lookup.DataSourceType == UiLookupDataSourceTypeEnum.StaticData)
@@ -734,12 +735,18 @@ public class DynamicTreeReport : XtraReport
                 staticLookupValues?.Count > 0 ? DynamicReportSqlBuilder.GetLookupBindingName(field) : bindingName,
                 lookup,
                 staticLookupValues,
+                isMultiValue,
                 isImage,
                 isHtml,
                 editorType);
         }
 
-        return new ReportColumn(field, bindingName, null, null, isImage, isHtml, editorType);
+        return new ReportColumn(field, bindingName, null, null, isMultiValue, isImage, isHtml, editorType);
+    }
+
+    private static bool IsMultiValueLookupEditor(string editorType)
+    {
+        return editorType is PlatformConsts.EditorTypes.dxTagBox or "dxGridBox";
     }
 
     private static TreeOptionDto GetTreeOptions(ListForm listForm)
@@ -767,6 +774,7 @@ public class DynamicTreeReport : XtraReport
         string BindingName,
         LookupDto Lookup,
         Dictionary<string, string> StaticLookupValues,
+        bool IsMultiValue,
         bool IsImage,
         bool IsHtml,
         string EditorType,