some changes

hyrax/app/models/complex_modality.rb

@@ -62,7 +62,7 @@ class ComplexModality < ActiveRecord::Base
     suffix = 1
     new_title = self.modality_title
 
-    while ComplexModality.where(modality_title: new_title).where.not(id: self.id).present?
+    while ComplexModality.where(modality_title: new_title, parent_source_identifier: complex_session.source_identifier).where.not(id: self.id).present?
       new_title = "#{self.modality_title}_#{suffix}"
       suffix += 1
     end

hyrax/app/models/complex_session.rb

@@ -63,7 +63,7 @@ class ComplexSession < ActiveRecord::Base
     suffix = 1
     new_title = session_title
 
-    while ComplexSession.where(session_title: new_title).where.not(id: self.id).present?
+    while ComplexSession.where(session_title: new_title, parent_source_identifier: complex_subject.source_identifier).where.not(id: self.id).present?
       new_title = "#{self.session_title}_#{suffix}"
       suffix += 1
     end

hyrax/app/models/complex_subject.rb

@@ -64,7 +64,7 @@ class ComplexSubject < ActiveRecord::Base
     suffix = 1
     new_title = self.subject_title
 
-    while ComplexSubject.where(subject_title: new_title).where.not(id: self.id).present?
+    while ComplexSubject.where(subject_title: new_title, parent_source_identifier: crc_dataset.source.first).where.not(id: self.id).present?
       new_title = "#{self.subject_title}_#{suffix}"
       suffix += 1
     end