diff --git a/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/MgmtNamedEntity.java b/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/MgmtNamedEntity.java
index 7579db72c..3a2478c25 100644
--- a/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/MgmtNamedEntity.java
+++ b/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/MgmtNamedEntity.java
@@ -25,8 +25,8 @@ import lombok.experimental.Accessors;
 @ToString(callSuper = true)
 public abstract class MgmtNamedEntity extends MgmtBaseEntity {
 
-    @JsonProperty(required = true)
     @Schema(example = "Name of entity")
+    @JsonProperty(required = true)
     private String name;
 
     @Schema(example = "Description of entity")
diff --git a/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/rollout/MgmtRolloutRestRequestBodyPost.java b/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/rollout/MgmtRolloutRestRequestBodyPost.java
index c72bb73b5..984d717a5 100644
--- a/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/rollout/MgmtRolloutRestRequestBodyPost.java
+++ b/hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/rollout/MgmtRolloutRestRequestBodyPost.java
@@ -14,6 +14,7 @@ import java.util.List;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
+import com.fasterxml.jackson.annotation.JsonProperty;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
@@ -64,12 +65,14 @@ import org.eclipse.hawkbit.mgmt.json.model.rolloutgroup.MgmtRolloutGroup;
 public class MgmtRolloutRestRequestBodyPost extends AbstractMgmtRolloutConditionsEntity {
 
     @Schema(description = "Target filter query language expression", example = "id==targets-*")
+    @JsonProperty(required = true)
     private String targetFilterQuery;
 
     @Schema(description = "The ID of distribution set of this rollout", example = "6")
+    @JsonProperty(required = true)
     private long distributionSetId;
 
-    @Schema(description = "The amount of groups the rollout should split targets into", example = "5")
+    @Schema(description = "The amount of groups the rollout should split targets into", example = "5", defaultValue = "1")
     private Integer amountGroups;
 
     @Schema(description = "Force time in milliseconds", example = "1691065781929")
diff --git a/hawkbit-mgmt/hawkbit-mgmt-resource/src/main/java/org/eclipse/hawkbit/mgmt/rest/resource/MgmtRolloutResource.java b/hawkbit-mgmt/hawkbit-mgmt-resource/src/main/java/org/eclipse/hawkbit/mgmt/rest/resource/MgmtRolloutResource.java
index a3422646b..46ebbf463 100644
--- a/hawkbit-mgmt/hawkbit-mgmt-resource/src/main/java/org/eclipse/hawkbit/mgmt/rest/resource/MgmtRolloutResource.java
+++ b/hawkbit-mgmt/hawkbit-mgmt-resource/src/main/java/org/eclipse/hawkbit/mgmt/rest/resource/MgmtRolloutResource.java
@@ -129,7 +129,7 @@ public class MgmtRolloutResource implements MgmtRolloutRestApi {
                 throw new ValidationException("Dynamic rollouts are not supported with groups");
             }
             if (rolloutRequestBody.getAmountGroups() != null) {
-                throw new ValidationException("Either 'amountGroups' or 'groups' must be defined in the request");
+                throw new ValidationException("If 'group' is set the 'amountGroups' must not be set in the request");
             }
             final List<GroupCreate> rolloutGroups = rolloutRequestBody.getGroups().stream()
                     .map(mgmtRolloutGroup -> MgmtRolloutMapper.fromRequest(
@@ -137,14 +137,13 @@ public class MgmtRolloutResource implements MgmtRolloutRestApi {
                             isConfirmationRequiredForGroup(mgmtRolloutGroup, rolloutRequestBody).orElse(confirmationFlowActive)))
                     .toList();
             rollout = rolloutManagement.create(create, rolloutGroups, rolloutGroupConditions);
-        } else if (rolloutRequestBody.getAmountGroups() != null) {
+        } else {
+            final int amountGroup = Optional.ofNullable(rolloutRequestBody.getAmountGroups()).orElse(1);
             final boolean confirmationRequired = rolloutRequestBody.getConfirmationRequired() == null
                     ? confirmationFlowActive
                     : rolloutRequestBody.getConfirmationRequired();
-            rollout = rolloutManagement.create(create, rolloutRequestBody.getAmountGroups(), confirmationRequired,
+            rollout = rolloutManagement.create(create, amountGroup, confirmationRequired,
                     rolloutGroupConditions, MgmtRolloutMapper.fromRequest(rolloutRequestBody.getDynamicGroupTemplate()));
-        } else {
-            throw new ValidationException("Either 'amountGroups' or 'groups' must be defined in the request");
         }
 
         return ResponseEntity.status(HttpStatus.CREATED).body(MgmtRolloutMapper.toResponseRollout(rollout, true));
diff --git a/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/RolloutManagement.java b/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/RolloutManagement.java
index 02968654a..d0db902fd 100644
--- a/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/RolloutManagement.java
+++ b/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/RolloutManagement.java
@@ -74,8 +74,7 @@ public interface RolloutManagement extends PermissionSupport {
     long count();
 
     /**
-     * Counts all {@link Rollout}s for a specific {@link DistributionSet} that
-     * are stoppable
+     * Counts all {@link Rollout}s for a specific {@link DistributionSet} that are stoppable
      * <p/>
      * No access control applied
      *