diff --git a/fusion_portal/models/visit.py b/fusion_portal/models/visit.py
index eaebdec1..f2b2b69e 100644
--- a/fusion_portal/models/visit.py
+++ b/fusion_portal/models/visit.py
@@ -216,6 +216,15 @@ class FusionAssessmentVisit(models.Model):
         if len(walkers) > 1:
             raise UserError(_('An ADP order can include only one walker / rollator.'))
 
+    def _assessment_sale_type(self, adp_assessment):
+        """Funding workflow key for an ADP equipment assessment, mirroring
+        fusion.assessment._create_draft_sale_order: ADP+ODSP when the client
+        type is an ODSP stream, plain ADP otherwise. ADP devices that share a
+        key are grouped onto one sale order."""
+        if adp_assessment.client_type in ('ods', 'acs', 'owp'):
+            return 'adp_odsp'
+        return 'adp'
+
     def action_complete_visit(self):
         """Group the visit's accessibility assessments by funding workflow and
         create one draft SO per workflow. ADP equipment assessments keep their