diff --git a/Technical/Indicators.csproj b/Technical/Indicators.csproj
index 39e70568..aa462d7f 100644
--- a/Technical/Indicators.csproj
+++ b/Technical/Indicators.csproj
@@ -38,6 +38,17 @@
     <ATAS_BASE>C:\Program Files (x86)\ATAS Platform</ATAS_BASE>
   </PropertyGroup>
 
+  <!-- DevExpress.Data must match the version referenced by the installed platform assemblies, otherwise the
+       WPF markup compiler fails with MC1000 (e.g. an install that ships v26.1 built against a v25.2 reference).
+       Installers leave older DevExpress versions next to the new one, so the newest one present is used.
+       Override with -p:DevExpressDataVersion=vXX.Y if needed. -->
+  <PropertyGroup Condition=" '$(Platform)' != 'Cross' And '$(DevExpressDataVersion)' == '' ">
+    <DevExpressDataVersion Condition=" Exists('$(ATAS_BASE)\DevExpress.Data.v26.1.dll') ">v26.1</DevExpressDataVersion>
+    <DevExpressDataVersion Condition=" '$(DevExpressDataVersion)' == '' And Exists('$(ATAS_BASE)\DevExpress.Data.v25.2.dll') ">v25.2</DevExpressDataVersion>
+    <DevExpressDataVersion Condition=" '$(DevExpressDataVersion)' == '' And Exists('$(ATAS_BASE)\DevExpress.Data.v23.2.dll') ">v23.2</DevExpressDataVersion>
+    <DevExpressDataVersion Condition=" '$(DevExpressDataVersion)' == '' ">v25.2</DevExpressDataVersion>
+  </PropertyGroup>
+
 	<ItemGroup>
 		<Reference Include="OFT.Attributes">
 			<HintPath>$(ATAS_BASE)\OFT.Attributes.dll</HintPath>
@@ -64,8 +75,8 @@
 		<Reference Include="OFT.Localization">
 			<HintPath>$(ATAS_BASE)\OFT.Localization.dll</HintPath>
 		</Reference>
-		<Reference Include="DevExpress.Data.v25.2" Condition=" '$(Platform)' != 'Cross' ">
-			<HintPath>$(ATAS_BASE)\DevExpress.Data.v25.2.dll</HintPath>
+		<Reference Include="DevExpress.Data.$(DevExpressDataVersion)" Condition=" '$(Platform)' != 'Cross' ">
+			<HintPath>$(ATAS_BASE)\DevExpress.Data.$(DevExpressDataVersion).dll</HintPath>
 		</Reference>
 		<Reference Include="Avalonia" Condition=" '$(Platform)' == 'Cross' ">
 			<HintPath>$(ATAS_BASE)\Avalonia.Base.dll</HintPath>
@@ -107,4 +118,15 @@
     <None Include="**\*.xaml" Exclude="$(DefaultItemExcludes);$(DefaultExcludesInProjectFolder)" />
   </ItemGroup>
 
+  <!-- The installed platform ships its own ATAS.Indicators.Technical.dll, and ResolveAssemblyReferences reaches it as a
+       dependency (OFT.Editors -> OFT.Platform.Core -> ATAS.Strategies -> ATAS.Indicators.Technical). Drop it so it neither
+       collides with this project's output in GenerateDepsFile (MSB4018 "An item with the same key has already been added")
+       nor gets copied over the freshly built assembly. -->
+  <Target Name="ExcludeInstalledSelfFromDependencies" AfterTargets="ResolveAssemblyReferences">
+    <ItemGroup>
+      <ReferenceDependencyPaths Remove="@(ReferenceDependencyPaths)" Condition=" '%(Filename)' == '$(AssemblyName)' " />
+      <ReferenceCopyLocalPaths Remove="@(ReferenceCopyLocalPaths)" Condition=" '%(Filename)' == '$(AssemblyName)' " />
+    </ItemGroup>
+  </Target>
+
 </Project>
\ No newline at end of file