diff --git a/cope2n-api/fwd/settings.py b/cope2n-api/fwd/settings.py
index 86d4832..8f05d50 100755
--- a/cope2n-api/fwd/settings.py
+++ b/cope2n-api/fwd/settings.py
@@ -245,6 +245,7 @@ FIELDS_BY_SUB = {
 BAD_THRESHOLD = 0.75
 NEED_REVIEW = 1.0
 
+DOC_TYPES = ["imei", "invoice"]
 SUB_FOR_BILLING = ["all", "seao"]
 FIELD = ["imei_number", "purchase_date", "retailername", "sold_to_party", "invoice_no"]
 
diff --git a/cope2n-api/fwd_api/api/accuracy_view.py b/cope2n-api/fwd_api/api/accuracy_view.py
index ec48e65..327b469 100755
--- a/cope2n-api/fwd_api/api/accuracy_view.py
+++ b/cope2n-api/fwd_api/api/accuracy_view.py
@@ -78,6 +78,7 @@ class AccuracyViewSet(viewsets.ViewSet):
                 description='Which subsidiary to be included',
                 type=OpenApiTypes.STR,
                 enum=list(settings.SUBS.keys()),
+                required=True
             ),
             OpenApiParameter(
                 name='request_id',
@@ -138,6 +139,7 @@ class AccuracyViewSet(viewsets.ViewSet):
                 location=OpenApiParameter.QUERY,
                 description='Filter by document type',
                 type=OpenApiTypes.STR,
+                enum=list(settings.DOC_TYPES.keys()),
                 required=False
             ),
         ],
@@ -231,7 +233,10 @@ class AccuracyViewSet(viewsets.ViewSet):
             if reviewed_result:
                 base_query &= Q(reviewed_result__icontains=reviewed_result)
             if doc_type:
-                base_query &= Q(doc_type__icontains=doc_type)
+                if doc_type.lower() == 'invoice':
+                    base_query &= Q(doc_type__regex=r'^invoice(,\s*invoice)*$')
+                elif doc_type.lower() == 'imei':
+                    base_query &= Q(doc_type__regex=r'^imei(,\s*imei)*$')
 
             if isinstance(max_accuracy, float):
                 base_query &= Q(raw_accuracy__lt=(