diff --git a/README.md b/README.md
index 4694ad5..ce9200e 100644
--- a/README.md
+++ b/README.md
@@ -178,7 +178,7 @@ Pre-built Docker images are automatically published to Docker Hub:
 
 **Available Tags**:
 - `latest` - Latest stable release from the main branch
-- `2026.2.0` - Specific version tags
+- `20XX.Y.Z` - Specific version tags
 - `main` - Latest build from main branch
 - `develop` - Latest development build
 
diff --git a/src/Server/Contracts/PdfFileValidationResponse.cs b/src/Server/Contracts/PdfFileValidationResponse.cs
index df71660..bf1ec00 100644
--- a/src/Server/Contracts/PdfFileValidationResponse.cs
+++ b/src/Server/Contracts/PdfFileValidationResponse.cs
@@ -12,4 +12,19 @@ public sealed class PdfFileValidationResponse : FileValidationResponse
     /// </summary>
     [JsonPropertyName("isSignatureValid")]
     public bool IsSignatureValid { get; set; } = false;
+
+    /// <summary>
+    /// Indicates whether the PDF part of the hybrid document is valid (e.g. PDF/A-3 conformant).
+    /// Note: under ZuGFeRD rule BR-FX-DE-03, PDF/A compliance errors are treated as warnings (not fatal)
+    /// when both buyer and seller are in Germany, so <see cref="FileValidationResponse.IsValid"/> may be
+    /// <c>true</c> even when this value is <c>false</c>.
+    /// </summary>
+    [JsonPropertyName("isPdfValid")]
+    public bool IsPdfValid { get; set; } = false;
+
+    /// <summary>
+    /// Indicates whether the embedded XML invoice data is valid according to the applicable standard.
+    /// </summary>
+    [JsonPropertyName("isXmlValid")]
+    public bool IsXmlValid { get; set; } = false;
 }
diff --git a/src/Server/Endpoints/PdfEndpoints.cs b/src/Server/Endpoints/PdfEndpoints.cs
index bb529f5..b8ce508 100644
--- a/src/Server/Endpoints/PdfEndpoints.cs
+++ b/src/Server/Endpoints/PdfEndpoints.cs
@@ -94,17 +94,29 @@ private static async Task<IResult> ValidateZuGFeRDPdfHandler(HttpRequest request
             }
 
             string status = "unknown";
+            string pdfStatus = "unknown";
+            string xmlStatus = "unknown";
             try
             {
                 if (!string.IsNullOrWhiteSpace(mustangCliResult.StandardOutput))
                 {
                     var mustangCliXmlResult = XDocument.Parse(mustangCliResult.StandardOutput);
+                    XElement? root = mustangCliXmlResult.Root;
+
                     // Use direct child Elements() instead of Descendants() to target the top-level <summary status="..."/>
                     // which represents the overall validation result aggregating both <pdf> and <xml> sub-results.
                     // See: https://www.mustangproject.org/commandline/#validate
-                    XElement? summary = mustangCliXmlResult.Root?.Elements("summary").FirstOrDefault();
-                    if (summary?.Attribute("status") is { } attributeValue)
-                        status = attributeValue.Value;
+                    if (root?.Elements("summary").FirstOrDefault()?.Attribute("status") is { } overallStatus)
+                        status = overallStatus.Value;
+
+                    // Parse per-section statuses so callers can distinguish PDF/A warnings from XML errors.
+                    // Under ZuGFeRD rule BR-FX-DE-03, PDF/A failures are warnings (not fatal) for German invoices,
+                    // so the overall status may be "valid" even when the PDF section reports "invalid".
+                    if (root?.Element("pdf")?.Elements("summary").FirstOrDefault()?.Attribute("status") is { } ps)
+                        pdfStatus = ps.Value;
+
+                    if (root?.Element("xml")?.Elements("summary").FirstOrDefault()?.Attribute("status") is { } xs)
+                        xmlStatus = xs.Value;
                 }
             }
             catch (Exception ex)
@@ -117,14 +129,18 @@ private static async Task<IResult> ValidateZuGFeRDPdfHandler(HttpRequest request
             if (mustangCliResult.ExitCode == (int)ErrorCode.Success)
                 statusCode = StatusCodes.Status200OK;
 
-            return Results.Json(new PdfFileValidationResponse
+            var result = new PdfFileValidationResponse
             {
                 ErrorCode = (ErrorCode)mustangCliResult.ExitCode,
                 IsValid = status == "valid",
+                IsPdfValid = pdfStatus == "valid",
+                IsXmlValid = xmlStatus == "valid",
                 IsSignatureValid = mustangCliResult.StandardOutput.Contains("<signature>valid</signature>"),
                 ValidationReport = mustangCliResult.StandardOutput,
                 DiagnosticsErrorMessage = mustangCliResult.ExitCode != (int)ErrorCode.Success ? mustangCliResult.StandardError : null
-            }, statusCode: statusCode);
+            };
+
+            return Results.Json(result, statusCode: statusCode);
         }
         catch (Exception ex)
         {
diff --git a/src/WebUI/src/pages/Index.tsx b/src/WebUI/src/pages/Index.tsx
index 1cdcb8f..4355cff 100644
--- a/src/WebUI/src/pages/Index.tsx
+++ b/src/WebUI/src/pages/Index.tsx
@@ -3,7 +3,7 @@ import { Card } from "@/components/ui/card";
 import { Label } from "@/components/ui/label";
 import { Switch } from "@/components/ui/switch";
 import { useToast } from "@/hooks/use-toast";
-import { AlertCircle, Beaker, CheckCircle, Download, FileText, Upload, XCircle } from "lucide-react";
+import { AlertCircle, Beaker, CheckCircle, Download, FileText, MinusCircle, Upload, XCircle } from "lucide-react";
 import { useEffect, useState } from "react";
 
 interface ValidationResult {
@@ -53,6 +53,10 @@ interface PdfFileValidationResult extends BaseFileOperationResult {
   isValid: boolean;
   /* Indicates if the PDF signature is valid */
   isSignatureValid: boolean;
+  /* Indicates if the PDF/A part is valid */
+  isPdfValid: boolean;
+  /* Indicates if the embedded XML invoice data is valid */
+  isXmlValid: boolean;
   /* XML validation report as string */
   validationReport: string;
 }
@@ -414,8 +418,14 @@ const Index = () => {
       let toastVariant: toastVariantType = data.success ? "success" : "destructive";
 
       if (operation === "validate-pdf" || operation === "validate-xml") {
-        if ((data as PdfFileValidationResult | FileValidationResult)?.isValid === false) {
-          toastVariant = "warning";
+        const validationResult = data as PdfFileValidationResult | FileValidationResult;
+        if (validationResult?.isValid === false) {
+          toastVariant = "destructive";
+        } else if (operation === "validate-pdf") {
+          const pdfResult = data as PdfFileValidationResult;
+          if (!pdfResult.isPdfValid) {
+            toastVariant = "warning";
+          }
         }
       }
 
@@ -434,9 +444,11 @@ const Index = () => {
               : `PDF generation failed after ${timeStr}. ${data.errorMessage || `Error code: ${data.errorCode}`}`;
           case "validate-pdf": {
             const pdfResult = data as PdfFileValidationResult;
-            return pdfResult.isValid
-              ? `${file.name} (${fileSize} KB) is valid. Processed in ${timeStr}`
-              : `${file.name} (${fileSize} KB) validation failed. Processed in ${timeStr}`;
+            if (!pdfResult.isValid)
+              return `${file.name} (${fileSize} KB) is invalid. Processed in ${timeStr}`;
+            if (!pdfResult.isPdfValid)
+              return `${file.name} (${fileSize} KB) is valid. PDF/A-3 has warnings (BR-FX-DE-03). Processed in ${timeStr}`;
+            return `${file.name} (${fileSize} KB) is valid. Processed in ${timeStr}`;
           }
           case "validate-xml": {
             const xmlResult = data as FileValidationResult;
@@ -688,6 +700,36 @@ const Index = () => {
                     </div>
                   </div>
 
+                  {/* PDF sub-validation breakdown */}
+                  {operation === "validate-pdf" && (() => {
+                    const pdfResult = result as PdfFileValidationResult;
+                    return (
+                      <div className="flex flex-wrap gap-3 text-sm">
+                        <div className="flex items-center gap-1.5">
+                          {pdfResult.isXmlValid
+                            ? <CheckCircle className="h-4 w-4 text-success" />
+                            : <XCircle className="h-4 w-4 text-destructive" />}
+                          <span>XML invoice</span>
+                        </div>
+                        <div className="flex items-center gap-1.5">
+                          {pdfResult.isPdfValid
+                            ? <CheckCircle className="h-4 w-4 text-success" />
+                            : <AlertCircle className="h-4 w-4 text-warning" />}
+                          <span>PDF/A-3</span>
+                          {!pdfResult.isPdfValid && pdfResult.isValid && (
+                            <span className="text-xs text-muted-foreground">(warning only — valid under BR-FX-DE-03)</span>
+                          )}
+                        </div>
+                        <div className="flex items-center gap-1.5">
+                          {pdfResult.isSignatureValid
+                            ? <CheckCircle className="h-4 w-4 text-success" />
+                            : <MinusCircle className="h-4 w-4 text-muted-foreground" />}
+                          <span>Signature</span>
+                        </div>
+                      </div>
+                    );
+                  })()}
+
                   {((result as FileValidationResult | PdfFileValidationResult)?.validationReport !== undefined || (result as ExtractXmlFromPdfResult)?.xml !== undefined || (result as ConvertXmlToPdfResult)?.pdf) !== undefined && (
                     <div>
                       <div className="flex items-center justify-between mb-2">
diff --git a/src/docker-build.ps1 b/src/docker-build.ps1
index a7524c6..e671599 100644
--- a/src/docker-build.ps1
+++ b/src/docker-build.ps1
@@ -1,6 +1,6 @@
 #!/usr/bin/env pwsh
 
-docker build -t docentric/e-invoice-validator:2026.2.0-dev -t docentric/e-invoice-validator:latest-dev .
+docker build -t docentric/e-invoice-validator:2026.3.0-dev -t docentric/e-invoice-validator:latest-dev .
 
 if ($LASTEXITCODE -ne 0)
 {
diff --git a/src/docker-compose.yml b/src/docker-compose.yml
index 0b88c36..941f436 100644
--- a/src/docker-compose.yml
+++ b/src/docker-compose.yml
@@ -12,7 +12,7 @@ services:
       dockerfile: Dockerfile
       # Build arguments for versioning
       args:
-        VERSION: ${VERSION:-2026.2.0}
+        VERSION: ${VERSION:-2026.3.0}
         BUILD_DATE: ${BUILD_DATE:-$(date -u +"%Y-%m-%dT%H:%M:%SZ")}
         VCS_REF: ${VCS_REF:-$(git rev-parse --short HEAD)}
       # Multi-platform builds (optional, requires buildx)