diff --git a/app/models/transfer_request.rb b/app/models/transfer_request.rb
index 37bf570f7a..4ab56b2457 100644
--- a/app/models/transfer_request.rb
+++ b/app/models/transfer_request.rb
@@ -154,9 +154,11 @@ def source_and_target_assets_are_different
   # @note This is particularly important when transferring out of the initial
   # {Receptacle} when there may be multiple active {Receptacle#requests_as_source}
   # @param request [Request] The request which is being processed
+  # NB. in rare circumstances we transfer out of input plates without submissions for
+  # aggregation, in which cases outer request is nil, so we also cannot get submission_id
   def outer_request=(request)
     @outer_request = request
-    self.submission_id = request.submission_id
+    self.submission_id = request&.submission_id
   end
 
   # Sets the {#outer_request} from just a request_id
diff --git a/config/default_records/plate_purposes/018_scrna_core_aggregation_purposes.yml b/config/default_records/plate_purposes/018_scrna_core_aggregation_purposes.yml
new file mode 100644
index 0000000000..95add726e0
--- /dev/null
+++ b/config/default_records/plate_purposes/018_scrna_core_aggregation_purposes.yml
@@ -0,0 +1,8 @@
+---
+# scRNA Core aggregation plate purpose definitions
+LRC GEM-X 5p CITE Cherrypick:
+  input_plate: false
+  stock_plate: false
+  cherrypickable_target: true
+  target_type: Plate
+  size: 96
diff --git a/config/default_records/request_types/015_limber_scrna_core_library_prep_request_types.yml b/config/default_records/request_types/015_limber_scrna_core_library_prep_request_types.yml
index 553a19982a..5014a95220 100644
--- a/config/default_records/request_types/015_limber_scrna_core_library_prep_request_types.yml
+++ b/config/default_records/request_types/015_limber_scrna_core_library_prep_request_types.yml
@@ -11,8 +11,7 @@ limber_scrna_core_library_prep:
   product_line_name: Short Read
   acceptable_purposes:
     - LRC GEM-X 5p Cherrypick
-    - LRC GEM-X 5p CITE SUP Input
-    - LRC GEM-X 5p CITE SUP XP
+    - LRC GEM-X 5p CITE Cherrypick
   library_types:
     - Chromium single cell GEM-X 5p v3 GE
     - Chromium single cell GEM-X 5p v3 BCR
diff --git a/config/default_records/submission_templates/012_scrna_core_library_prep_submission_templates.yml b/config/default_records/submission_templates/012_scrna_core_library_prep_submission_templates.yml
index 4469e29cb6..c63b754c43 100644
--- a/config/default_records/submission_templates/012_scrna_core_library_prep_submission_templates.yml
+++ b/config/default_records/submission_templates/012_scrna_core_library_prep_submission_templates.yml
@@ -1,11 +1,5 @@
 # Submission templates for the aggregation and library prep parts of the scRNA Core pipeline.
 ---
-Limber-Htp - scRNA Core Aggregation:
-  submission_class_name: "LinearSubmission"
-  related_records:
-    request_type_keys: ["limber_scrna_core_aggregation"]
-    product_line_name: Short Read
-    product_catalogue_name: scRNA Core
 Limber-Htp - scRNA Core Library Prep:
   submission_class_name: "LinearSubmission"
   related_records:
diff --git a/spec/models/transfer_request_spec.rb b/spec/models/transfer_request_spec.rb
index 061885ebb8..dad7b59b73 100644
--- a/spec/models/transfer_request_spec.rb
+++ b/spec/models/transfer_request_spec.rb
@@ -384,6 +384,26 @@
     end
   end
 
+  describe '#outer_request=' do
+    subject(:transfer_request) { build(:transfer_request, asset: source, target_asset: destination) }
+
+    context 'when request is nil' do
+      it 'sets submission_id to nil' do
+        transfer_request.outer_request = nil
+        expect(transfer_request.submission_id).to be_nil
+      end
+    end
+
+    context 'when request is present' do
+      let(:library_request) { create(:library_request, asset: source) }
+
+      it 'sets submission_id to the request submission_id' do
+        transfer_request.outer_request = library_request
+        expect(transfer_request.submission_id).to eq(library_request.submission_id)
+      end
+    end
+  end
+
   context 'when failing a transfer request with downstream assets' do
     # Labware
     let(:original_plate) { create(:plate_with_untagged_wells, well_count: 1) }