diff --git a/CODEOWNERS b/CODEOWNERS
index 508ee364fc..1589f7bb68 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -10,9 +10,6 @@
 /com.avaloq.tools.ddk.check.*/**                       @dsldevkit/sca
 /com.avaloq.tools.ddk.checkcfg.*/**                    @dsldevkit/sca
 
-# Valid DSL (obsolete SCA)
-/com.avaloq.tools.ddk.xtext.valid*/**                  @dsldevkit/sca
-
 # Generating workflow
 /com.avaloq.tools.ddk.workflow/**                      @dsldevkit/codeowners
 
diff --git a/README.md b/README.md
index 71f37e8bfb..fc6ee7a635 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,6 @@ You can find more detailed documentation and examples at [ddk.tools.avaloq.com](
 | com.avaloq.tools.ddk.xtext.checkcfg.\* | Check Configuration DSL                                    |
 | com.avaloq.tools.ddk.xtext.scope.\*    | Scope DSL                                                  |
 | com.avaloq.tools.ddk.xtext.export.\*   | Export DSL                                                 |
-| com.avaloq.tools.ddk.xtext.valid.\*    | obsolete and is replaced by Check DSL                      |
 | com.avaloq.tools.ddk.typesystem        | Basics for building a typesystem for a DSL                 |
 | com.avaloq.tools.ddk.test.\*           | Support for writing tests for DSLs                         |
 | com.avaloq.tools.ddk.xtextspy.\*       | View to support debugging a DSL                            |
diff --git a/com.avaloq.tools.ddk.workflow/src/com/avaloq/tools/ddk/workflow/Ddk.mwe2 b/com.avaloq.tools.ddk.workflow/src/com/avaloq/tools/ddk/workflow/Ddk.mwe2
index f8bba783db..2ee7e087fe 100644
--- a/com.avaloq.tools.ddk.workflow/src/com/avaloq/tools/ddk/workflow/Ddk.mwe2
+++ b/com.avaloq.tools.ddk.workflow/src/com/avaloq/tools/ddk/workflow/Ddk.mwe2
@@ -18,7 +18,6 @@ Workflow {
     component = @ Scope {}
     component = @ Check {}
     component = @ CheckCfg {}
-    component = @ Valid {}
     component = @ TypeModel {}
     component = @ ModelInference {}
 }
diff --git a/com.avaloq.tools.ddk.workflow/src/com/avaloq/tools/ddk/workflow/GenerateValid.mwe2 b/com.avaloq.tools.ddk.workflow/src/com/avaloq/tools/ddk/workflow/GenerateValid.mwe2
deleted file mode 100644
index 6bf233e44e..0000000000
--- a/com.avaloq.tools.ddk.workflow/src/com/avaloq/tools/ddk/workflow/GenerateValid.mwe2
+++ /dev/null
@@ -1,165 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2016 Avaloq Group AG and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- *     Avaloq Group AG - initial API and implementation
- *******************************************************************************/
-module Valid
-
-import org.eclipse.emf.mwe.utils.*
-import org.eclipse.xtext.ui.generator.*
-
-import com.avaloq.tools.ddk.xtext.*
-import com.avaloq.tools.ddk.xtext.generator.*
-import com.avaloq.tools.ddk.xtext.generator.ui.*
-
-import com.avaloq.tools.foundation.xtext.generator.*
-import com.avaloq.tools.foundation.xtext.generator.ui.*
-
-import com.avaloq.tools.ddk.*
-
-var languageName = "Valid"
-var baseName = "Valid"
-var grammar = "valid"
-var grammarURI = "classpath:/com/avaloq/tools/ddk/xtext/${grammar}/${baseName}.xtext"
-var editorFileExtensions = "valid"
-
-var baseProjectName = "com.avaloq.tools.ddk.xtext"
-
-var projectNameRt = "${baseProjectName}.${grammar}"
-var projectNameUi = "${baseProjectName}.${grammar}.ui"
-var projectNameIde = "${baseProjectName}.${grammar}.ide"
-
-var runtimeProject = "../${projectNameRt}"
-var ideProject = "../${projectNameIde}"
-var uiProject = "../${projectNameUi}"
-
-var projectName = "${baseProjectName}.${grammar}"
-var rootPath = ".."
-var modelDirectory = "metamodel/com/avaloq/tools/ddk/xtext/${grammar}"
-var metamodelPlugin = "com.avaloq.tools.ddk.xtext.${grammar}"
-var metamodelBase = "platform:/resource/${metamodelPlugin}"
-
-Workflow {
-
-    bean = com.avaloq.tools.ddk.xtext.generator.util.StandaloneSetup {
-      resourceSet = org.eclipse.xtext.resource.XtextResourceSet : resourceSet {}
-      platformUri = "${runtimeProject}/.."
-      scanClassPath = true
-      uriMap = {from = "platform:/plugin/" to = "platform:/resource/"}
-      registerGenModelFile = "platform:/resource/org.eclipse.xtext/org/eclipse/xtext/Xtext.genmodel"
-      registerGenModelFile = "platform:/resource/org.eclipse.emf.ecore/model/Ecore.genmodel"
-      registerGenModelFile = "platform:/resource/com.avaloq.tools.ddk.xtext.expression/metamodel/com/avaloq/tools/ddk/xtext/expression/Expression.genmodel"
-      registerEcoreFile = "${metamodelBase}/${modelDirectory}/${baseName}.ecore"
-      registerGenModelFile = "${metamodelBase}/${modelDirectory}/${baseName}.genmodel"
-    }
-
-    component = DirectoryCleaner {
-        directory = "${runtimeProject}/src-gen"
-    }
-
-    component = DirectoryCleaner {
-        directory = "${ideProject}/src-gen"
-    }
-
-    component = DirectoryCleaner {
-        directory = "${uiProject}/src-gen"
-    }
-
-    component = org.eclipse.xtext.xtext.generator.XtextGenerator {
-        configuration = GeneratorModule {
-          project = generator.model.project.ProjectConfig {
-            baseName = projectName
-            rootPath = rootPath
-            runtimeSuffix = ""
-            forceDisableIdeProject = false
-            runtimeTest = {
-              enabled = false
-            }
-            eclipsePlugin = {
-              enabled = true
-            }
-            eclipsePluginTest = {
-              enabled = false
-            }
-            createEclipseMetaData = true
-          }
-          code = {
-            encoding = "UTF-8"
-            lineDelimiter = "\n"
-            fileHeader = "/*\n * generated by Xtext\n */"
-            preferXtendStubs = false
-          }
-        }
-
-        language = com.avaloq.tools.ddk.workflow.ExtendedLanguageConfig {
-            resourceSet = resourceSet
-            grammarUri = grammarURI
-            languageName = languageName
-            fileExtensions = editorFileExtensions
-
-            // Java API to access grammar elements (required by several other fragments)
-            fragment = org.eclipse.xtext.xtext.generator.grammarAccess.GrammarAccessFragment2 {}
-
-            fragment = com.avaloq.tools.ddk.xtext.generator.ecore.EcoreGeneratorFragment2 {
-              genModel = "${metamodelBase}/${modelDirectory}/${baseName}.genmodel"
-              suppressSrcPath = "../com.avaloq.tools.ddk.typesystem/src" // Sure no relevant *ImplCustom
-              suppressSrcPath = "../org.eclipse.emf.ecore/src"
-              suppressSrcPath = "../org.eclipse.xtext.xbase/src"
-              suppressSrcPath = "../org.eclipse.xtext/src"
-              suppressSrcPath = "../org.eclipse.xtext.common.types/src"
-              generateEdit = false
-            }
-
-            // the serialization component
-            fragment = org.eclipse.xtext.xtext.generator.serializer.SerializerFragment2 {}
-
-            // a custom ResourceFactory for use with EMF
-            fragment = org.eclipse.xtext.xtext.generator.resourceFactory.ResourceFactoryFragment2 {}
-
-            // the following fragment generates an Antlr parser -->
-            fragment =  org.eclipse.xtext.xtext.generator.parser.antlr.XtextAntlrGeneratorFragment2 {}
-
-            // java-based API for validation
-            fragment = org.eclipse.xtext.xtext.generator.validation.ValidatorFragment2 {}
-
-            // scoping and exporting API
-            fragment = org.eclipse.xtext.xtext.generator.scoping.ImportNamespacesScopingFragment2 {}
-            fragment = org.eclipse.xtext.xtext.generator.exporting.SimpleNamesFragment2 {}
-            fragment = org.eclipse.xtext.xtext.generator.builder.BuilderIntegrationFragment2 {}
-
-            // formatter API
-            fragment = org.eclipse.xtext.xtext.generator.formatting.Formatter2Fragment2 {
-              generateStub = false
-            }
-
-            // labeling API
-            fragment = org.eclipse.xtext.xtext.generator.ui.labeling.LabelProviderFragment2 {}
-
-            // outline API
-            fragment = org.eclipse.xtext.xtext.generator.ui.outline.OutlineTreeProviderFragment2 {}
-            fragment = org.eclipse.xtext.xtext.generator.ui.outline.QuickOutlineFragment2 {}
-
-            // quickfix API
-            fragment = org.eclipse.xtext.xtext.generator.ui.quickfix.QuickfixProviderFragment2 {}
-
-            // content assist API
-            fragment = org.eclipse.xtext.xtext.generator.ui.contentAssist.ContentAssistFragment2 {}
-
-            // provides a compare view
-            fragment =  org.eclipse.xtext.xtext.generator.ui.compare.CompareFragment2 {}
-
-            fragment = BundleVersionStripperFragment {
-              bundle = "org.antlr.runtime"
-              bundle = "org.eclipse.xtext.xbase.lib"
-              bundle = "org.eclipse.xtend.lib"
-              bundle = "org.objectweb.asm"
-            }
-
-        }
-    }
-}