diff --git a/vorgang-manager-server/src/main/java/de/ozgcloud/vorgang/common/migration/M011_SetDefaultCollaborationLevel.java b/vorgang-manager-server/src/main/java/de/ozgcloud/vorgang/common/migration/M011_SetDefaultCollaborationLevel.java
new file mode 100644
index 0000000000000000000000000000000000000000..b87ca0ed026919f0c81ea26687e1eae8f82efdd5
--- /dev/null
+++ b/vorgang-manager-server/src/main/java/de/ozgcloud/vorgang/common/migration/M011_SetDefaultCollaborationLevel.java
@@ -0,0 +1,39 @@
+package de.ozgcloud.vorgang.common.migration;
+
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.data.mongodb.core.query.Update;
+
+import io.mongock.api.annotations.ChangeUnit;
+import io.mongock.api.annotations.Execution;
+import io.mongock.api.annotations.RollbackExecution;
+
+@ChangeUnit(id = "2024-07-29 17:30:00 OZG-6259", order = "M011", author = "mkuester", runAlways = true)
+public class M011_SetDefaultCollaborationLevel { // NOSONAR
+
+	private static final String VORGANG_COLLECTION = "vorgang";
+
+	static final String HEADER_FIELD = "header";
+	static final String COLLABORATION_LEVEL_FIELD = "collaborationLevel";
+	static final String HEADER_COLLABORATION_LEVEL_FIELD = HEADER_FIELD + "." + COLLABORATION_LEVEL_FIELD;
+	private static final int DEFAULT_COLLABORATION_LEVEL = 0;
+
+	@Execution
+	public void doMigration(MongoTemplate template) {
+		template.updateMulti(createFilterQuery(), createUpdate(), VORGANG_COLLECTION);
+	}
+
+	private Query createFilterQuery() {
+		return new Query(Criteria.where(HEADER_COLLABORATION_LEVEL_FIELD).exists(false));
+	}
+
+	private Update createUpdate() {
+		return new Update().set(HEADER_COLLABORATION_LEVEL_FIELD, DEFAULT_COLLABORATION_LEVEL);
+	}
+
+	@RollbackExecution
+	public void rollback() {
+		// kein rollback implementiert
+	}
+}
\ No newline at end of file
diff --git a/vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/common/migration/M011_SetDefaultCollaborationLevelITCase.java b/vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/common/migration/M011_SetDefaultCollaborationLevelITCase.java
new file mode 100644
index 0000000000000000000000000000000000000000..9b5b8b9a499aaf17baf73c073dbf0f75ef7cc694
--- /dev/null
+++ b/vorgang-manager-server/src/test/java/de/ozgcloud/vorgang/common/migration/M011_SetDefaultCollaborationLevelITCase.java
@@ -0,0 +1,142 @@
+package de.ozgcloud.vorgang.common.migration;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.bson.Document;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.core.query.Query;
+
+import com.thedeanda.lorem.LoremIpsum;
+
+import de.ozgcloud.common.test.DataITCase;
+
+@DataITCase
+class M011_SetDefaultCollaborationLevelITCase {
+
+	private final M011_SetDefaultCollaborationLevel migration = new M011_SetDefaultCollaborationLevel();
+
+	private final String nameField = "name";
+	private final String nameFieldValue = LoremIpsum.getInstance().getWords(1);
+
+	private final String organisationsEinheitField = "organisationsEinheitId";
+	private final String organisationsEinheitFieldValue = LoremIpsum.getInstance().getWords(1);
+
+	@Autowired
+	private MongoTemplate template;
+	@Autowired
+	private MigrationDbTestUtils dbTestUtils;
+
+	@DisplayName("Do migration")
+	@Nested
+	class TestDoMigration {
+
+		@BeforeEach
+		void mock() {
+			dbTestUtils.dropVorgangCollection();
+		}
+
+		@DisplayName("on missing collaboration level")
+		@Nested
+		class TestOnMissingCollaborationLevel {
+
+			@BeforeEach
+			void initVorgang() {
+				dbTestUtils.saveVorgang(createVorgangWithName());
+			}
+
+			@Test
+			void shouldSetDefaultCollaborationLevel() {
+				migration.doMigration(template);
+
+				assertThat(getVorgangHeader()).containsEntry(M011_SetDefaultCollaborationLevel.COLLABORATION_LEVEL_FIELD, 0);
+			}
+
+			@Test
+			void shouldKeepVorgangData() {
+				migration.doMigration(template);
+
+				assertThat(getVorgang()).containsEntry(nameField, nameFieldValue);
+			}
+
+			@Test
+			void shouldKeepHeaderData() {
+				migration.doMigration(template);
+
+				assertThat(getVorgangHeader()).containsEntry(organisationsEinheitField,
+						organisationsEinheitFieldValue);
+			}
+		}
+
+		@DisplayName("on existing collaboration level")
+		@Nested
+		class TestOnExistingCollaborationLevel {
+
+			@BeforeEach
+			void initVorgang() {
+				dbTestUtils.saveVorgang(createVorgangWithCollaborationLevel());
+			}
+
+			@Test
+			void shouldKeepCollaborationLevel() {
+				migration.doMigration(template);
+
+				assertThat(getVorgangHeader()).containsEntry(M011_SetDefaultCollaborationLevel.COLLABORATION_LEVEL_FIELD, 1);
+			}
+
+			@Test
+			void shouldKeepVorgangData() {
+				migration.doMigration(template);
+
+				assertThat(getVorgang()).containsEntry(nameField, nameFieldValue);
+			}
+
+			@Test
+			void shouldKeepHeaderData() {
+				migration.doMigration(template);
+
+				assertThat(getVorgangHeader()).containsEntry(organisationsEinheitField,
+						organisationsEinheitFieldValue);
+			}
+		}
+
+		private Document createVorgangWithCollaborationLevel() {
+			var vorgang = createVorgangWithName();
+			vorgang.append(M011_SetDefaultCollaborationLevel.HEADER_FIELD, createHeaderWithCollaborationLevel());
+			return vorgang;
+		}
+
+		private Document createHeaderWithCollaborationLevel() {
+			var header = createHeaderWithOrganisationsEinheitId();
+			header.append(M011_SetDefaultCollaborationLevel.COLLABORATION_LEVEL_FIELD, 1);
+			return header;
+		}
+
+		private Document createVorgangWithName() {
+			var vorgang = new Document();
+			vorgang.append(nameField, nameFieldValue);
+			vorgang.append(M011_SetDefaultCollaborationLevel.HEADER_FIELD, createHeaderWithOrganisationsEinheitId());
+			return vorgang;
+		}
+
+		private Document createHeaderWithOrganisationsEinheitId() {
+			var header = new Document();
+			header.append(organisationsEinheitField, organisationsEinheitFieldValue);
+			return header;
+		}
+
+		private Document getVorgangHeader() {
+			return (Document) getVorgang().get(M011_SetDefaultCollaborationLevel.HEADER_FIELD);
+		}
+
+		private Document getVorgang() {
+			var vorgaenge = dbTestUtils.findVorgang(new Query());
+			assertThat(vorgaenge).hasSize(1);
+			return vorgaenge.get(0);
+		}
+	}
+}
\ No newline at end of file