diff --git a/internal/database/migrations/20260304063215_fix_fifo_chickin_out.down.sql b/internal/database/migrations/20260304063215_fix_fifo_chickin_out.down.sql
new file mode 100644
index 00000000..26e637ff
--- /dev/null
+++ b/internal/database/migrations/20260304063215_fix_fifo_chickin_out.down.sql
@@ -0,0 +1,9 @@
+BEGIN;
+
+DELETE FROM fifo_stock_v2_route_rules
+WHERE flag_group_code = 'AYAM'
+  AND lane = 'USABLE'
+  AND function_code = 'CHICKIN_OUT'
+  AND source_table = 'project_chickins';
+
+COMMIT;
diff --git a/internal/database/migrations/20260304063215_fix_fifo_chickin_out.up.sql b/internal/database/migrations/20260304063215_fix_fifo_chickin_out.up.sql
new file mode 100644
index 00000000..3967da36
--- /dev/null
+++ b/internal/database/migrations/20260304063215_fix_fifo_chickin_out.up.sql
@@ -0,0 +1,34 @@
+BEGIN;
+
+INSERT INTO fifo_stock_v2_route_rules(
+    flag_group_code,
+    lane,
+    function_code,
+    source_table,
+    source_id_column,
+    product_warehouse_col,
+    quantity_col,
+    used_quantity_col,
+    pending_quantity_col,
+    scope_sql,
+    legacy_type_key,
+    allow_pending_default,
+    is_active
+)
+VALUES
+    ('AYAM', 'USABLE', 'CHICKIN_OUT', 'project_chickins', 'id', 'product_warehouse_id', 'usage_qty', NULL, 'pending_usage_qty', 'deleted_at IS NULL', 'PROJECT_CHICKIN', TRUE, TRUE)
+ON CONFLICT (flag_group_code, lane, function_code, source_table) DO UPDATE
+SET
+    source_id_column = EXCLUDED.source_id_column,
+    product_warehouse_col = EXCLUDED.product_warehouse_col,
+    quantity_col = EXCLUDED.quantity_col,
+    used_quantity_col = EXCLUDED.used_quantity_col,
+    pending_quantity_col = EXCLUDED.pending_quantity_col,
+    scope_sql = EXCLUDED.scope_sql,
+    legacy_type_key = EXCLUDED.legacy_type_key,
+    allow_pending_default = EXCLUDED.allow_pending_default,
+    updated_at = NOW(),
+    -- Keep existing is_active (do not override disable migration if it was intentional).
+    is_active = fifo_stock_v2_route_rules.is_active;
+
+COMMIT;
diff --git a/internal/modules/production/chickins/services/chickin.service.go b/internal/modules/production/chickins/services/chickin.service.go
index 27ef3743..85127792 100644
--- a/internal/modules/production/chickins/services/chickin.service.go
+++ b/internal/modules/production/chickins/services/chickin.service.go
@@ -28,6 +28,7 @@ import (
 	"github.com/gofiber/fiber/v2"
 	"github.com/sirupsen/logrus"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 )
 
 type ChickinService interface {
@@ -518,6 +519,21 @@ func (s chickinService) Approval(c *fiber.Ctx, req *validation.Approve) ([]entit
 		touchedProductWarehouseIDs := make(map[uint]struct{})
 
 		for _, approvableID := range approvableIDs {
+			// Re-check latest approval inside transaction to prevent double-approve races.
+			var latest entity.Approval
+			if err := dbTransaction.WithContext(c.Context()).
+				Table("approvals").
+				Where("approvable_type = ? AND approvable_id = ?", utils.ApprovalWorkflowChickin.String(), approvableID).
+				Order("id DESC").
+				Limit(1).
+				Clauses(clause.Locking{Strength: "UPDATE"}).
+				Take(&latest).Error; err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+				return fiber.NewError(fiber.StatusInternalServerError, "Failed to recheck approval status")
+			}
+			if latest.Id != 0 && latest.StepNumber != uint16(utils.ChickinStepPengajuan) {
+				return fiber.NewError(fiber.StatusBadRequest, fmt.Sprintf("ProjectFlockKandang %d sudah tidak berada di tahap PENGAJUAN", approvableID))
+			}
+
 			if _, err := approvalSvc.CreateApproval(
 				c.Context(),
 				utils.ApprovalWorkflowChickin,