diff --git a/apps/as/src/entities/sewer-bsc-plan/model/sewer-bsc-plan-apply-payload-schema.ts b/apps/as/src/entities/sewer-bsc-plan/model/sewer-bsc-plan-apply-payload-schema.ts
index 0060467b7..2980cfffb 100644
--- a/apps/as/src/entities/sewer-bsc-plan/model/sewer-bsc-plan-apply-payload-schema.ts
+++ b/apps/as/src/entities/sewer-bsc-plan/model/sewer-bsc-plan-apply-payload-schema.ts
@@ -64,7 +64,7 @@ export const sewerBscPlanFnrsCstItemSchema = z.object({
 /** 백엔드 SewerBscPlanApplySaveRequestDto.SewerBscPlanSplmntDmndItem */
 export const sewerBscPlanSplmntDmndItemSchema = z.object({
   splmntDmndSn: z.number().nullish(),
-  splmntArtclComCd: z.string().optional(),
+  splmntArtclComCd: z.string().nullish(),
   splmntDmndCn: z.string().optional(),
   splmntDmndDt: z.string().optional(),
   splmntDmndAtchFileGroupId: z.string().optional(),
diff --git a/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts b/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts
index 6e042cf16..bf2d11767 100644
--- a/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts
+++ b/apps/as/src/pages/fnrs-cnsltn/lib/button-config.ts
@@ -6,6 +6,7 @@ export const FNRS_CNSLTN_VIEW_BUTTON_ACTION = {
   envoSbmsn: "envoSbmsn",
   rjct: "rjct",
   sncnAprv: "sncnAprv",
+  lclRply: "lclRply",
   rvwRply: "rvwRply",
   rqstTechRvw: "rqstTechRvw",
   fileSplmnt: "fileSplmnt",
@@ -39,6 +40,7 @@ const ROLE_STATUS_BUTTON_ACTIONS: Record<string, Record<string, FnrsCnsltnViewBu
   },
   ROLE_USER04: {
     ST: [FNRS_CNSLTN_VIEW_BUTTON_ACTION.envoSbmsn, FNRS_CNSLTN_VIEW_BUTTON_ACTION.rjct],
+    RM: [FNRS_CNSLTN_VIEW_BUTTON_ACTION.lclRply],
     EP: [FNRS_CNSLTN_VIEW_BUTTON_ACTION.sncnAprv],
   },
   ROLE_USER03: {
diff --git a/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts b/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts
index 3bc32621a..0faa372e9 100644
--- a/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts
+++ b/apps/as/src/pages/fnrs-cnsltn/lib/fnrs-cnsltn-regist-schema.ts
@@ -86,7 +86,7 @@ export const fnrsCnsltnRegistSchema = z.object({
   splmntDmndList: z.array(
     z.object({
       splmntDmndSn: z.number().nullish(),
-      splmntArtclComCd: z.string().nullable(),
+      splmntArtclComCd: z.string().nullish(),
       splmntArtclCdNm: z.string().nullish(),
       splmntDmndCn: z.string().optional(),
       splmntDmndDt: z.string().optional(),
diff --git a/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx b/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx
index f3bb8d088..ca8f71da3 100644
--- a/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx
+++ b/apps/as/src/pages/fnrs-cnsltn/ui/components/floating-action-buttons.tsx
@@ -272,6 +272,19 @@ function FloatingActionButtons({
     });
   }
 
+  async function handleLclRplyClick() {
+    const payload: DocPrgrsUpdateRequestDto = {
+      docNo,
+      docSeComCd,
+      prgrsSttsComCd: "RB",
+    };
+    await executeAction({
+      action: FNRS_CNSLTN_VIEW_BUTTON_ACTION.lclRply,
+      request: payload,
+      successMessage: "지자체 회신이 완료되었습니다.",
+    });
+  }
+
   async function handleRjctClick() {
     const payload: DocPrgrsUpdateRequestDto = {
       docNo,
@@ -491,6 +504,11 @@ function FloatingActionButtons({
                   환경청제출
                 </Button>
               )}
+              {shouldShowButton(FNRS_CNSLTN_VIEW_BUTTON_ACTION.lclRply) && (
+                <Button onClick={handleLclRplyClick} disabled={isProcessing}>
+                  지자체회신
+                </Button>
+              )}
               {shouldShowButton(FNRS_CNSLTN_VIEW_BUTTON_ACTION.rjct) && (
                 <Button color="red" onClick={handleRjctClick} disabled={isProcessing}>
                   반려
@@ -733,6 +751,7 @@ const buttonActionHandlers: Record<FnrsCnsltnViewButtonAction, ActionHandler> =
   envoSbmsn: handleChangePrgrsSttsComCd,
   rjct: handleChangePrgrsSttsComCd,
   sncnAprv: handleChangePrgrsSttsComCd,
+  lclRply: handleChangePrgrsSttsComCd,
   rvwRply: handleTechReview,
   rqstTechRvw: handleRequestExamine,
   fileSplmnt: handleDmndSplmnt,
diff --git a/apps/as/src/pages/fnrs-cnsltn/ui/sections/business-cost-section.tsx b/apps/as/src/pages/fnrs-cnsltn/ui/sections/business-cost-section.tsx
index d892187f6..45af2a9f7 100644
--- a/apps/as/src/pages/fnrs-cnsltn/ui/sections/business-cost-section.tsx
+++ b/apps/as/src/pages/fnrs-cnsltn/ui/sections/business-cost-section.tsx
@@ -32,7 +32,7 @@ function BusinessCostSection({ bizCstList }: BusinessCostSectionProps) {
               <TableHead colSpan={2}>증감</TableHead>
             </TableRow>
             <TableRow>
-              <TableHead className="w-[12rem]">(C-B)</TableHead>
+              <TableHead className="w-[12rem]">(C-A)</TableHead>
               <TableHead className="w-[6rem]">%</TableHead>
             </TableRow>
           </TableHeader>
diff --git a/apps/as/src/pages/fnrs-cnsltn/ui/sections/tech-review-opinion-section.tsx b/apps/as/src/pages/fnrs-cnsltn/ui/sections/tech-review-opinion-section.tsx
index 08f2651f4..caa4a3ada 100644
--- a/apps/as/src/pages/fnrs-cnsltn/ui/sections/tech-review-opinion-section.tsx
+++ b/apps/as/src/pages/fnrs-cnsltn/ui/sections/tech-review-opinion-section.tsx
@@ -280,7 +280,10 @@ const TechReviewOpinionSection = forwardRef<
         <SectionCollapsible title={`${REVIEW_STEP_LABELS.KECO} 검토의견`}>
           <div className="space-y-6">
             {kecoRvwList.length > 0 ? <TechReviewOpinionTable items={kecoRvwList} /> : null}
+            {/* 
+            재원협의에서 환경공단 검토의견은 자동 생성
             {renderOpinionForm("KECO")}
+            */}
           </div>
         </SectionCollapsible>
       ) : null}
diff --git a/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts b/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts
index e32309255..4dfdf8685 100644
--- a/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts
+++ b/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts
@@ -22,10 +22,10 @@ export function mapDetailToFormData(data: InstlSncnMngDetResponse): InstlSncnReg
       bizCn: detDto.bizCn,
       taskSeComCd: parseTaskSeComCdFromApi(detDto.taskSeComCd),
       sncnSeComCd: detDto.sncnSeComCd,
-      dsgnrNm: detDto.dsgnrNm,
-      dsgnrTelno: detDto.dsgnrTelno,
-      dsgnrOgdpNm: detDto.dsgnrOgdpNm,
-      dsgnrEmlAddr: detDto.dsgnrEmlAddr,
+      dsgnrNm: detDto.dsgnrNm ?? "",
+      dsgnrTelno: detDto.dsgnrTelno ?? "",
+      dsgnrOgdpNm: detDto.dsgnrOgdpNm ?? "",
+      dsgnrEmlAddr: detDto.dsgnrEmlAddr ?? "",
       aplcntNm: detDto.aplcntNm ?? "",
       aplcntMblTelno: detDto.aplcntMblTelno ?? "",
       aplcntOgdpNm: detDto.aplcntOgdpNm ?? "",
diff --git a/apps/as/src/pages/instl-sncn/lib/instl-sncn-regist-schema.ts b/apps/as/src/pages/instl-sncn/lib/instl-sncn-regist-schema.ts
index 7fe74a337..755d3df63 100644
--- a/apps/as/src/pages/instl-sncn/lib/instl-sncn-regist-schema.ts
+++ b/apps/as/src/pages/instl-sncn/lib/instl-sncn-regist-schema.ts
@@ -78,7 +78,7 @@ export const instlSncnRegistSchema = z.object({
   splmntDmndList: z.array(
     z.object({
       splmntDmndSn: z.number().nullish(),
-      splmntArtclComCd: z.string().optional(),
+      splmntArtclComCd: z.string().nullish(),
       splmntArtclCdNm: z.string().nullish(),
       splmntDmndCn: z.string().optional(),
       splmntDmndDt: z.string().optional(),
diff --git a/apps/as/src/pages/instl-sncn/ui/sections/business-cost-section.tsx b/apps/as/src/pages/instl-sncn/ui/sections/business-cost-section.tsx
index 7de55ee64..08711bdf8 100644
--- a/apps/as/src/pages/instl-sncn/ui/sections/business-cost-section.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/sections/business-cost-section.tsx
@@ -32,7 +32,7 @@ function BusinessCostSection({ bizCstList }: BusinessCostSectionProps) {
               <TableHead colSpan={2}>증감</TableHead>
             </TableRow>
             <TableRow>
-              <TableHead className="w-[12rem]">(C-B)</TableHead>
+              <TableHead className="w-[12rem]">(C-A)</TableHead>
               <TableHead className="w-[6rem]">%</TableHead>
             </TableRow>
           </TableHeader>
diff --git a/apps/as/src/widgets/pbadms-sprt/ui/business-cost-form-section.tsx b/apps/as/src/widgets/pbadms-sprt/ui/business-cost-form-section.tsx
index 969a4613b..22aa35c82 100644
--- a/apps/as/src/widgets/pbadms-sprt/ui/business-cost-form-section.tsx
+++ b/apps/as/src/widgets/pbadms-sprt/ui/business-cost-form-section.tsx
@@ -18,7 +18,7 @@ import {
 } from "@common/components";
 
 import { buildAcntgCostItems, recalculateBizCstTotals } from "../lib/business-cost-form-utils";
-import { calcDiffPercent } from "../lib/format-utils";
+import { calcDiffPercent } from "../lib/format-utils";
 
 interface BusinessCostFormData {
   bizCstList: Array<{
@@ -95,7 +95,7 @@ function BusinessCostFormSection() {
               <TableHead colSpan={2}>증감</TableHead>
             </TableRow>
             <TableRow>
-              <TableHead className="w-[12rem]">(C-B)</TableHead>
+              <TableHead className="w-[12rem]">(C-A)</TableHead>
               <TableHead className="w-[6rem]">%</TableHead>
             </TableRow>
           </TableHeader>