diff --git a/.repository-projection.json b/.repository-projection.json
index bd318c2..0246f8d 100644
--- a/.repository-projection.json
+++ b/.repository-projection.json
@@ -3,11 +3,11 @@
   "projection": "api",
   "projectionSchemaVersion": 1,
   "sourceRepository": "dx-corp/mono",
-  "sourceSha": "d0d58ccb0f20b687dd375f134fb6232234a29ce3",
+  "sourceSha": "05ffa5bd55862a27569a1bb6083c242d13a599bc",
   "destinationRepository": "dx-corp/api",
-  "priorProjectedBase": "0954ddfc9f36f96d97d5505a306220d1f8d2f40e",
+  "priorProjectedBase": "dd768bf09229b6b6ffcbbe8f1f5620f2845ec3d4",
   "definitionDigest": "4c1601bee99ccc8305013324608e9c146999b21427179d25fd342f69aebd37bd",
   "toolDigest": "43a26c174df3e078b4b041bce280da81df7309f4",
-  "contentDigest": "df9864e28f86892251a2676f9bf33b12856faf8ada094151731a269a619aaa16",
+  "contentDigest": "bea163129b47328627024b8940b373962f8dd5d51294a87430b54cf5d70878a7",
   "publicationEligible": true
 }
diff --git a/openapi/deixicpublic/v1/sdk.openapi.yaml b/openapi/deixicpublic/v1/sdk.openapi.yaml
index 92af2e6..1507deb 100644
--- a/openapi/deixicpublic/v1/sdk.openapi.yaml
+++ b/openapi/deixicpublic/v1/sdk.openapi.yaml
@@ -1056,6 +1056,16 @@ paths:
                 $ref: '#/components/schemas/deixicpublic.v1.ReconcileComplianceLibraryResponse'
 components:
   schemas:
+    deixicpublic.v1.BusinessSourceFieldProperty:
+      type: string
+      title: BusinessSourceFieldProperty
+      enum:
+        - BUSINESS_SOURCE_FIELD_PROPERTY_UNSPECIFIED
+        - BUSINESS_SOURCE_FIELD_PROPERTY_DISPLAY_NAME
+        - BUSINESS_SOURCE_FIELD_PROPERTY_EXTERNAL_ID
+      description: |-
+        Binds a record to a caller-named connection resource. The response is the
+         projected record; the binding itself stays with the implementation.
     deixicpublic.v1.ClientMcpMode:
       type: string
       title: ClientMcpMode
@@ -1293,11 +1303,18 @@ components:
         recordId:
           type: string
           title: record_id
+        groupIds:
+          type: array
+          items:
+            type: string
+          title: group_ids
+        fields:
+          type: array
+          items:
+            $ref: '#/components/schemas/deixicpublic.v1.BusinessSourceFieldMapping'
+          title: fields
       title: BindBusinessObjectSourceRequest
       additionalProperties: false
-      description: |-
-        Binds a record to a caller-named connection resource. The response is the
-         projected record; the binding itself stays with the implementation.
     deixicpublic.v1.BindBusinessObjectSourceResponse:
       type: object
       properties:
@@ -1608,8 +1625,41 @@ components:
         blueprintOrigin:
           title: blueprint_origin
           $ref: '#/components/schemas/deixicpublic.v1.BusinessBlueprintOrigin'
+        displayFieldId:
+          type: string
+          title: display_field_id
+        fields:
+          type: array
+          items:
+            $ref: '#/components/schemas/deixicpublic.v1.BusinessObjectTypeField'
+          title: fields
       title: BusinessObjectType
       additionalProperties: false
+    deixicpublic.v1.BusinessObjectTypeField:
+      type: object
+      properties:
+        fieldId:
+          type: string
+          title: field_id
+        groupId:
+          type: string
+          title: group_id
+        sourceMappable:
+          type: boolean
+          title: source_mappable
+      title: BusinessObjectTypeField
+      additionalProperties: false
+    deixicpublic.v1.BusinessSourceFieldMapping:
+      type: object
+      properties:
+        fieldId:
+          type: string
+          title: field_id
+        property:
+          title: property
+          $ref: '#/components/schemas/deixicpublic.v1.BusinessSourceFieldProperty'
+      title: BusinessSourceFieldMapping
+      additionalProperties: false
     deixicpublic.v1.BusinessTextList:
       type: object
       properties:
@@ -2344,6 +2394,9 @@ components:
         afterKey:
           type: string
           title: after_key
+        peerObjectId:
+          type: string
+          title: peer_object_id
       title: ListBusinessObjectRelationshipsRequest
       additionalProperties: false
     deixicpublic.v1.ListBusinessObjectRelationshipsResponse:
diff --git a/proto/deixicpublic/v1/sdk.proto b/proto/deixicpublic/v1/sdk.proto
index 896ab97..88263ae 100644
--- a/proto/deixicpublic/v1/sdk.proto
+++ b/proto/deixicpublic/v1/sdk.proto
@@ -454,17 +454,25 @@ message ListBusinessObjectsResponse {
   repeated BusinessObject objects = 1;
   string next_object_id = 2;
 }
+
 // Names the built-in blueprint member a tenant type was cloned from.
 message BusinessBlueprintOrigin {
   string blueprint_id = 1;
   int64 version = 2;
   string source_type_id = 3;
 }
+message BusinessObjectTypeField {
+  string field_id = 1;
+  string group_id = 2;
+  bool source_mappable = 3;
+}
 message BusinessObjectType {
   string type_id = 1;
   string name = 2;
   int64 revision = 3;
   BusinessBlueprintOrigin blueprint_origin = 4;
+  string display_field_id = 5;
+  repeated BusinessObjectTypeField fields = 6;
 }
 message ListBusinessObjectTypesRequest {
   string organization_id = 1;
@@ -490,8 +498,18 @@ message ListBusinessBlueprintsRequest {
 message ListBusinessBlueprintsResponse {
   repeated BusinessBlueprint blueprints = 1;
 }
+
 // Binds a record to a caller-named connection resource. The response is the
 // projected record; the binding itself stays with the implementation.
+enum BusinessSourceFieldProperty {
+  BUSINESS_SOURCE_FIELD_PROPERTY_UNSPECIFIED = 0;
+  BUSINESS_SOURCE_FIELD_PROPERTY_DISPLAY_NAME = 1;
+  BUSINESS_SOURCE_FIELD_PROPERTY_EXTERNAL_ID = 2;
+}
+message BusinessSourceFieldMapping {
+  string field_id = 1;
+  BusinessSourceFieldProperty property = 2;
+}
 message BindBusinessObjectSourceRequest {
   string organization_id = 1;
   string workspace_id = 2;
@@ -501,6 +519,8 @@ message BindBusinessObjectSourceRequest {
   string connection_id = 6;
   string family_stable_id = 7;
   string record_id = 8;
+  repeated string group_ids = 9;
+  repeated BusinessSourceFieldMapping fields = 10;
 }
 message BindBusinessObjectSourceResponse {
   BusinessObject object = 1;
@@ -517,6 +537,7 @@ message ListBusinessObjectRelationshipsRequest {
   string relationship_id = 4;
   int32 limit = 5;
   string after_key = 6;
+  string peer_object_id = 7;
 }
 message ListBusinessObjectRelationshipsResponse {
   repeated BusinessObjectRelationship relationships = 1;
@@ -611,6 +632,7 @@ message ComplianceLibraryChange {
   ComplianceLibraryChangeKind kind = 1;
   string object_id = 2;
 }
+
 // Preview returns the plan digest; apply must name that digest and is polled
 // with the same idempotency key until applied is true.
 message ReconcileComplianceLibraryRequest {