diff --git a/dinapy/schemas/collectingeventschema.py b/dinapy/schemas/collectingeventschema.py
index f9c2f67..0f7b920 100644
--- a/dinapy/schemas/collectingeventschema.py
+++ b/dinapy/schemas/collectingeventschema.py
@@ -20,12 +20,12 @@ class Meta:
 class Collectors(BaseSchema):
 
 	class Meta:
-		type_ = 'collectors'
+		type_ = 'person'
 
 class Attachment(BaseSchema):
 
 	class Meta:
-		type_ = 'attachment'
+		type_ = 'metadata'
 	
 class CollectingEventSchema(Schema):
 	'''Schema for a Collecting Event used for serializing and deserializing JSON.'''
@@ -70,10 +70,10 @@ class CollectingEventSchema(Schema):
 	managedAttributes = SkipUndefinedField(fields.Dict,attribute="attributes.managedAttributes")
 	remarks = SkipUndefinedField(fields.Str,allow_none=True, attribute="attributes.remarks")
 
-	collectionMethod = create_relationship("collecting-event","collectionMethod")
-	protocol = create_relationship("collecting-event","protocol")
-	collectors = create_relationship("collecting-event","collectors")
-	attachment = create_relationship("collecting-event","attachment")
+	collectionMethod = create_relationship("collecting-event","collection-method","collectionMethod")
+	protocol = create_relationship("collecting-event","protocol","protocol")
+	collectors = create_relationship("collecting-event","person","collectors")
+	attachment = create_relationship("collecting-event","metadata","attachment")
 
 	meta = fields.DocumentMeta()
 
diff --git a/dinapy/schemas/materialsampleschema.py b/dinapy/schemas/materialsampleschema.py
index 9c301b2..a6abc74 100644
--- a/dinapy/schemas/materialsampleschema.py
+++ b/dinapy/schemas/materialsampleschema.py
@@ -110,17 +110,17 @@ def object_deserialization(self, data, **kwargs):
 		return MaterialSampleDTO(**data)
 	
 	collection = create_relationship("material-sample","collection")
-	collectingEvent = create_relationship("material-sample","collectingEvent")
-	preparationType = create_relationship("material-sample","preparationType")
-	preparationMethod = create_relationship("material-sample","preparationMethod")
-	parentMaterialSample = create_relationship("material-sample","parentMaterialSample")
-	preparedBy = create_relationship("material-sample","preparedBy")
+	collectingEvent = create_relationship("material-sample","collecting-event","collectingEvent")
+	preparationType = create_relationship("material-sample","preparation-type","preparationType")
+	preparationMethod = create_relationship("material-sample","preparation-method","preparationMethod")
+	parentMaterialSample = create_relationship("material-sample","material-sample","parentMaterialSample")
+	preparedBy = create_relationship("material-sample","person","preparedBy")
 	attachment = create_relationship("material-sample","metadata","attachment")
-	preparationProtocol = create_relationship("material-sample","preparationProtocol")
+	preparationProtocol = create_relationship("material-sample","protocol","preparationProtocol")
 	projects = create_relationship("material-sample","project","projects")
-	assemblages = create_relationship("material-sample","assemblages")
+	assemblages = create_relationship("material-sample","assemblage","assemblages")
 	organism = create_relationship("material-sample","organism")
-	storageUnit = create_relationship("material-sample","storageUnit")
+	storageUnit = create_relationship("material-sample","storage-unit","storageUnit")
 	
 	meta = fields.DocumentMeta()
 	
diff --git a/dinapy/schemas/metadata_schema.py b/dinapy/schemas/metadata_schema.py
index 09d394a..288d13e 100644
--- a/dinapy/schemas/metadata_schema.py
+++ b/dinapy/schemas/metadata_schema.py
@@ -108,11 +108,11 @@ class MetadataSchema(Schema):
     )
 
     # Relationships
-    acMetadataCreator = create_relationship("metadata","person", "acMetadataCreator")
+    acMetadataCreator = create_relationship("metadata","person","acMetadataCreator")
 
-    derivatives = create_relationship("metadata","derivatives")
+    derivatives = create_relationship("metadata","derivative","derivatives")
 
-    dcCreator = create_relationship("metadata","person", "dcCreator")
+    dcCreator = create_relationship("metadata","person","dcCreator")
 
     @post_load
     def set_none_to_undefined(self, data, **kwargs):
diff --git a/dinapy/schemas/molecular_analysis_result_schema.py b/dinapy/schemas/molecular_analysis_result_schema.py
index 63761f8..184c3f9 100644
--- a/dinapy/schemas/molecular_analysis_result_schema.py
+++ b/dinapy/schemas/molecular_analysis_result_schema.py
@@ -9,7 +9,7 @@
 
 class Attachment(BaseSchema):
     class Meta:
-        type_ = 'attachment'
+        type_ = 'metadata'
 
 class MolecularAnalysisResultSchema(Schema):
     id = fields.Str(load_only=True)
@@ -17,7 +17,7 @@ class MolecularAnalysisResultSchema(Schema):
     createdBy = SkipUndefinedField(fields.Str, load_only=True, attribute="attributes.createdBy")
     createdOn = SkipUndefinedField(fields.Str, load_only=True, attribute="attributes.createdOn")
 
-    attachment = create_relationship("molecular-analysis-result","attachment")
+    attachment = create_relationship("molecular-analysis-result","metadata","attachment")
 
     @post_load
     def set_none_to_undefined(self, data, **kwargs):
diff --git a/dinapy/schemas/project_schema.py b/dinapy/schemas/project_schema.py
index 9759e8e..b5452a7 100644
--- a/dinapy/schemas/project_schema.py
+++ b/dinapy/schemas/project_schema.py
@@ -9,7 +9,7 @@
 
 class Attachment(BaseSchema):
     class Meta:
-        type_ = 'attachment'
+        type_ = 'metadata'
 
 class ProjectSchema(Schema):
     id = fields.Str(load_only=True)
@@ -23,7 +23,7 @@ class ProjectSchema(Schema):
     multilingualDescription = SkipUndefinedField(fields.Dict,allow_none=True,attribute="attributes.multilingualDescription")
     extensionValues = SkipUndefinedField(fields.Dict,allow_none=True,attribute="attributes.extensionValues")
 
-    attachment = create_relationship("project","attachment")
+    attachment = create_relationship("project","metadata","attachment")
 
     meta = fields.DocumentMeta()
 
diff --git a/dinapy/schemas/storageunitusageschema.py b/dinapy/schemas/storageunitusageschema.py
index c527ea6..72b7781 100644
--- a/dinapy/schemas/storageunitusageschema.py
+++ b/dinapy/schemas/storageunitusageschema.py
@@ -25,8 +25,8 @@ class StorageUnitUsage(Schema):
 	createdOn = SkipUndefinedField(fields.DateTime, load_only=True,attribute="attributes.createdOn")
 	createdBy = SkipUndefinedField(fields.Str, load_only=True,attribute="attributes.createdBy")
 
-	storageUnit = create_relationship("storage-unit-usage","storageUnit")
-	storageUnitType = create_relationship("storage-unit-usage","storageUnitType")
+	storageUnit = create_relationship("storage-unit-usage","storage-unit","storageUnit")
+	storageUnitType = create_relationship("storage-unit-usage","storage-unit-type","storageUnitType")
 	
 	@post_load
 	def set_none_to_undefined(self, data, **kwargs):
diff --git a/tests/material_sample_schema_test.py b/tests/material_sample_schema_test.py
index ebff7ae..ae0a642 100644
--- a/tests/material_sample_schema_test.py
+++ b/tests/material_sample_schema_test.py
@@ -228,8 +228,8 @@
 					"related": "/api/v1/material-sample/182ed68e-7536-4ad4-868c-399c8e5d70f3/parentMaterialSample"
 				},
 						"data": {
-						"id": "01902d3a-0ec1-7a57-8284-f4ba3aff1664",
-						"type": "parent-material-sample"
+							"id": "01902d3a-0ec1-7a57-8284-f4ba3aff1664",
+							"type": "material-sample"
 						},
 			},
 			"collectingEvent": {