diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverSubscribeTests.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverSubscribeTests.cs
index 84e5df09..42a94254 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverSubscribeTests.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverSubscribeTests.cs
@@ -245,7 +245,7 @@ public sealed class GalaxyDriverSubscribeTests
         using var driver = new GalaxyDriver("g", Opts());
         var ex = await Should.ThrowAsync<NotSupportedException>(() =>
             driver.SubscribeAsync(["x"], TimeSpan.FromSeconds(1), CancellationToken.None));
-        ex.Message.ShouldContain("PR 4.W");
+        ex.Message.ShouldContain("GalaxyDriver.SubscribeAsync requires");
     }
 
     /// <summary>Verifies subscription falls back to configured interval when zero is passed.</summary>
diff --git a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverWriteTests.cs b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverWriteTests.cs
index 61c86d06..9c08b942 100644
--- a/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverWriteTests.cs
+++ b/tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverWriteTests.cs
@@ -188,15 +188,15 @@ public sealed class GalaxyDriverWriteTests
         writer.Calls.ShouldBeEmpty();
     }
 
-    /// <summary>Verifies that WriteAsync throws when no writer is configured, referencing PR 4.4.</summary>
+    /// <summary>Verifies that WriteAsync throws a clear guard error when no writer is configured.</summary>
     [Fact]
-    public async Task WriteAsync_NoWriter_Throws_PointingAtPR44()
+    public async Task WriteAsync_NoWriter_Throws()
     {
         var driver = new GalaxyDriver("g", Opts());
 
         var ex = await Should.ThrowAsync<NotSupportedException>(() =>
             driver.WriteAsync([new WriteRequest("x", 1)], CancellationToken.None));
-        ex.Message.ShouldContain("PR 4.4");
+        ex.Message.ShouldContain("GalaxyDriver.WriteAsync requires");
     }
 
     /// <summary>Verifies that WriteAsync throws ObjectDisposedException after the driver is disposed.</summary>