diff --git a/cg/meta/workflow/analysis.py b/cg/meta/workflow/analysis.py
index e64d68db0d..d5516895b0 100644
--- a/cg/meta/workflow/analysis.py
+++ b/cg/meta/workflow/analysis.py
@@ -206,7 +206,9 @@ def get_case_source_type(self, case_id: str) -> str | None:
         Raises:
             CgError: If different sources are set for the samples linked to a case.
         """
-        sample_ids: Iterator[str] = self.status_db.get_sample_ids_by_case_id(case_id=case_id)
+        sample_ids: Iterator[str] = self.status_db.get_original_sample_ids_by_case_id(
+            case_id=case_id
+        )
         source_types: set[str | None] = {
             self.lims_api.get_source(sample_id) for sample_id in sample_ids
         }
diff --git a/cg/store/crud/read.py b/cg/store/crud/read.py
index 209d0f35d2..097d8f8bf2 100644
--- a/cg/store/crud/read.py
+++ b/cg/store/crud/read.py
@@ -345,6 +345,16 @@ def get_sample_ids_by_case_id(self, case_id: str = None) -> Iterator[str]:
         for link in case.links:
             yield link.sample.internal_id
 
+    def get_original_sample_ids_by_case_id(self, case_id: str = None) -> Iterator[str]:
+        """Return original sample ids (go to original sample id for downloaded samples) from case id."""
+        case: Case = self.get_case_by_internal_id(internal_id=case_id)
+        self._is_case_found(case=case, case_id=case_id)
+        for link in case.links:
+            if link.sample.from_sample:
+                original_sample: Sample = link.sample.from_sample
+                yield original_sample.internal_id
+            yield link.sample.internal_id
+
     def get_case_by_name_and_customer(self, customer: Customer, case_name: str) -> Case:
         """Find a case by case name within a customer."""
         return apply_case_filter(