diff --git a/app/Actions/Project/UpdateDOI.php b/app/Actions/Project/UpdateDOI.php
index e58d11bd..cf5e64a7 100644
--- a/app/Actions/Project/UpdateDOI.php
+++ b/app/Actions/Project/UpdateDOI.php
@@ -39,17 +39,17 @@ public function update($model)
         }
 
         if ($project) {
-            $project->addRelatedIdentifiers($this->doiService);
+            $project->updateDOIMetadata($this->doiService);
             $studies = $project->studies;
         }
         if ($studies) {
             foreach ($studies as $study) {
                 if ($study instanceof Study) {
-                    $study->addRelatedIdentifiers($this->doiService);
+                    $study->updateDOIMetadata($this->doiService);
                     $datasets = $study->datasets;
                     foreach ($datasets as $dataset) {
                         if ($dataset instanceof Dataset) {
-                            $dataset->addRelatedIdentifiers($this->doiService);
+                            $dataset->updateDOIMetadata($this->doiService);
                         }
                     }
                 }
diff --git a/app/Console/Commands/UpdateDOI.php b/app/Console/Commands/UpdateDOI.php
index 807aedc8..1f292c73 100644
--- a/app/Console/Commands/UpdateDOI.php
+++ b/app/Console/Commands/UpdateDOI.php
@@ -67,16 +67,13 @@ public function handle()
             foreach ($study->datasets as $dataset) {
                 echo $dataset->identifier."\r\n";
                 $dataset->updateDOIMetadata($this->doiService);
-                $dataset->addRelatedIdentifiers($this->doiService);
             }
             $study->updateDOIMetadata($this->doiService);
-            $study->addRelatedIdentifiers($this->doiService);
         }
 
         foreach ($projects as $project) {
             echo $project->identifier."\r\n";
             $project->updateDOIMetadata($this->doiService);
-            $project->addRelatedIdentifiers($this->doiService);
         }
     }
 }
diff --git a/app/Http/Controllers/ProjectController.php b/app/Http/Controllers/ProjectController.php
index 103ae195..167689f5 100644
--- a/app/Http/Controllers/ProjectController.php
+++ b/app/Http/Controllers/ProjectController.php
@@ -440,7 +440,6 @@ public function update(Request $request, UpdateProject $updater, Project $projec
         $updater->update($project, $request->all());
         if ($project->is_public) {
             $project->updateDOIMetadata($this->doiService);
-            $project->addRelatedIdentifiers($this->doiService);
         }
 
         return $request->wantsJson() ? new JsonResponse('', 200) : back()->with('success', 'Project updated successfully');
diff --git a/app/Http/Controllers/StudyController.php b/app/Http/Controllers/StudyController.php
index 04916646..f7f30bbe 100644
--- a/app/Http/Controllers/StudyController.php
+++ b/app/Http/Controllers/StudyController.php
@@ -94,7 +94,6 @@ public function update(Request $request, UpdateStudy $updater, Study $study)
         $study->load(['datasets', 'sample.molecules', 'tags']);
         if ($study->is_public) {
             $study->updateDOIMetadata($this->doiService);
-            $study->addRelatedIdentifiers($this->doiService);
         }
 
         return $request->wantsJson()
diff --git a/app/Models/HasDOI.php b/app/Models/HasDOI.php
index b17db325..7943534c 100644
--- a/app/Models/HasDOI.php
+++ b/app/Models/HasDOI.php
@@ -79,6 +79,59 @@ public function updateDOIMetadata($doiService)
             $doi = $this->doi;
             if ($doi !== null) {
                 $attributes = $this->getMetadata();
+
+                if ($this instanceof Project) {
+                    foreach ($this->studies as &$study) {
+                        $relatedIdentifier = [
+                            'relatedIdentifier' => $study->doi,
+                            'relatedIdentifierType' => 'DOI',
+                            'relationType' => 'HasPart',
+                        ];
+                        array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
+                        foreach ($study->datasets as &$dataset) {
+                            $relatedIdentifier = [
+                                'relatedIdentifier' => $dataset->doi,
+                                'relatedIdentifierType' => 'DOI',
+                                'relationType' => 'HasPart',
+                            ];
+                            array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
+                        }
+                    }
+                } elseif ($this instanceof Study) {
+                    if ($this->project) {
+                        $relatedIdentifier = [
+                            'relatedIdentifier' => $this->project->doi,
+                            'relatedIdentifierType' => 'DOI',
+                            'relationType' => 'IsPartOf',
+                        ];
+                        array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
+                    }
+                    foreach ($this->datasets as &$dataset) {
+                        $relatedIdentifier = [
+                            'relatedIdentifier' => $dataset->doi,
+                            'relatedIdentifierType' => 'DOI',
+                            'relationType' => 'HasPart',
+                        ];
+                        array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
+                    }
+                } elseif ($this instanceof Dataset) {
+                    if ($this->project) {
+                        $relatedIdentifier = [
+                            'relatedIdentifier' => $this->project->doi,
+                            'relatedIdentifierType' => 'DOI',
+                            'relationType' => 'IsPartOf',
+                        ];
+                        array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
+                    }
+
+                    $relatedIdentifier = [
+                        'relatedIdentifier' => $this->study->doi,
+                        'relatedIdentifierType' => 'DOI',
+                        'relationType' => 'IsPartOf',
+                    ];
+                    array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
+                }
+
                 $doiResponse = $doiService->updateDOI($doi, $attributes);
                 $this->datacite_schema = $doiResponse;
                 $this->save();
@@ -251,70 +304,4 @@ public function getMetadata()
 
         return $attributes;
     }
-
-    public function addRelatedIdentifiers($doiService)
-    {
-        $attributes = $this->getMetadata();
-        if ($this instanceof Project) {
-            foreach ($this->studies as &$study) {
-                $relatedIdentifier = [
-                    'relatedIdentifier' => $study->doi,
-                    'relatedIdentifierType' => 'DOI',
-                    'relationType' => 'HasPart',
-                ];
-                array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
-                foreach ($study->datasets as &$dataset) {
-                    $relatedIdentifier = [
-                        'relatedIdentifier' => $dataset->doi,
-                        'relatedIdentifierType' => 'DOI',
-                        'relationType' => 'HasPart',
-                    ];
-                    array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
-                }
-            }
-            $doiResponse = $doiService->updateDOI($this->doi, $attributes);
-            $this->datacite_schema = $doiResponse;
-            $this->save();
-
-        } elseif ($this instanceof Study) {
-            if ($this->project) {
-                $relatedIdentifier = [
-                    'relatedIdentifier' => $this->project->doi,
-                    'relatedIdentifierType' => 'DOI',
-                    'relationType' => 'IsPartOf',
-                ];
-                array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
-            }
-            foreach ($this->datasets as &$dataset) {
-                $relatedIdentifier = [
-                    'relatedIdentifier' => $dataset->doi,
-                    'relatedIdentifierType' => 'DOI',
-                    'relationType' => 'HasPart',
-                ];
-                array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
-            }
-            $doiResponse = $doiService->updateDOI($this->doi, $attributes);
-            $this->datacite_schema = $doiResponse;
-            $this->save();
-        } elseif ($this instanceof Dataset) {
-            if ($this->project) {
-                $relatedIdentifier = [
-                    'relatedIdentifier' => $this->project->doi,
-                    'relatedIdentifierType' => 'DOI',
-                    'relationType' => 'IsPartOf',
-                ];
-                array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
-            }
-
-            $relatedIdentifier = [
-                'relatedIdentifier' => $this->study->doi,
-                'relatedIdentifierType' => 'DOI',
-                'relationType' => 'IsPartOf',
-            ];
-            array_push($attributes['relatedIdentifiers'], $relatedIdentifier);
-            $doiResponse = $doiService->updateDOI($this->doi, $attributes);
-            $this->datacite_schema = $doiResponse;
-            $this->save();
-        }
-    }
 }