diff --git a/api/restHandler/app/BuildPipelineRestHandler.go b/api/restHandler/app/BuildPipelineRestHandler.go
index c42740e426b..38e1e94bc93 100644
--- a/api/restHandler/app/BuildPipelineRestHandler.go
+++ b/api/restHandler/app/BuildPipelineRestHandler.go
@@ -280,11 +280,18 @@ func (handler PipelineConfigRestHandlerImpl) PatchCiMaterialSourceWithAppIdAndEn
 	patchRequest, userId, err := handler.parseSourceChangeRequest(w, r)
 	if err != nil {
 		handler.Logger.Errorw("Parse error, PatchCiMaterialSource", "err", err, "PatchCiMaterialSource", patchRequest)
+		common.WriteJsonResp(w, err, nil, http.StatusBadRequest)
+		return
+	}
+	if !(patchRequest.Source.Type == pipelineConfig.SOURCE_TYPE_BRANCH_FIXED || patchRequest.Source.Type == pipelineConfig.SOURCE_TYPE_BRANCH_REGEX) {
+		handler.Logger.Errorw("Unsupported source type, PatchCiMaterialSource", "err", err, "PatchCiMaterialSource", patchRequest)
+		common.WriteJsonResp(w, err, "source.type not supported", http.StatusBadRequest)
 		return
 	}
 	token := r.Header.Get("token")
 	if err = handler.authorizeCiSourceChangeRequest(w, patchRequest, token); err != nil {
 		handler.Logger.Errorw("Authorization error, PatchCiMaterialSource", "err", err, "PatchCiMaterialSource", patchRequest)
+		common.WriteJsonResp(w, err, nil, http.StatusUnauthorized)
 		return
 	}
 
diff --git a/api/restHandler/app/BuildPipelineRestHandler_test.go b/api/restHandler/app/BuildPipelineRestHandler_test.go
index d2befef306e..8425b73f053 100644
--- a/api/restHandler/app/BuildPipelineRestHandler_test.go
+++ b/api/restHandler/app/BuildPipelineRestHandler_test.go
@@ -79,7 +79,7 @@ func TestPipelineConfigRestHandlerImpl_PatchCiMaterialSource(t *testing.T) {
 			fields: fields{
 				validator: validator.New(),
 			},
-			body: "{\"appId\":4, \"id\": 5 ,\"ciMaterial\":[{\"gitMaterialId\":4,\"id\":5,\"source\":{\"type\":\"SOURCE_TYPE_BRANCH_FIXED\",\"value\":\"main3\",\"regex\":\"\"}}]}",
+			body: "{\"appId\":4, \"id\": 5 ,\"source\":{\"type\":\"SOURCE_TYPE_BRANCH_FIXED\",\"value\":\"main3\",\"regex\":\"\"}}",
 			setup: func(fields2 *fields) {
 				ctrl := gomock.NewController(t)
 				fields2.pipelineBuilder = mock_pipeline.NewMockPipelineBuilder(ctrl)
diff --git a/specs/ci-pipeline/ci-pipeline-change-source.yaml b/specs/ci-pipeline/ci-pipeline-change-source.yaml
new file mode 100644
index 00000000000..b1a7c7d5b66
--- /dev/null
+++ b/specs/ci-pipeline/ci-pipeline-change-source.yaml
@@ -0,0 +1,44 @@
+openapi: "3.0.0"
+info:
+  version: 1.0.0
+  title: CiPipeline material change source
+paths:
+  /orchestrator/app/ci-pipeline/patch-source:
+    patch:
+      description: update source of a ci-matrial
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/RequestBody"
+      responses:
+        "200":
+          description: Successfully fetched commit info. if CommitInfo is null, then commit is not found.
+          content:
+            application/json:
+              schema:
+                type: object
+
+#{"appId": 16, "environmentId": 1, "source": {"type":"SOURCE_TYPE_BRANCH_FIXED", "value": "main1", "regex":""}}
+# Components
+components:
+  schemas:
+    RequestBody:
+      type: object
+      properties:
+        appId:
+          type: integer
+        environmentId:
+          type: integer
+        source:
+          type: object
+          properties:
+            type:
+              type: string
+              description: "SOURCE_TYPE_BRANCH_FIXED / SOURCE_TYPE_BRANCH_REGEX"
+            value:
+              type: string
+              description: "name of the branch"
+            regex:
+              type: string
+              description: "regular expression when type is SOURCE_TYPE_BRANCH_REGEX"
\ No newline at end of file