diff --git a/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx b/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx
index b0b9a1e5..e4e8a615 100644
--- a/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx
+++ b/src/components/floor-plan/modal/circuitTrestle/step/StepUp.jsx
@@ -649,12 +649,18 @@ export default function StepUp(props) {
                             </tr>
                           </thead>
                           <tbody>
-                            {pcsItem.serQtyList.map((item, serQtyIdx) => {
+                            {pcsItem?.serQtyList?.map((item, serQtyIdx) => {
                               return (
                                 <tr
                                   key={`row-${serQtyIdx}`}
                                   className={`${item.selected ? 'on' : ''}`}
                                   style={{ cursor: allocationType === 'auto' ? 'pointer' : 'default' }}
+                                  onClick={() => {
+                                    if (stepUp?.pcsItemList.length !== 1) {
+                                      return
+                                    }
+                                    handleRowClick(idx, serQtyIdx, item.paralQty)
+                                  }}
                                 >
                                   <td
                                     className="al-r"
@@ -667,33 +673,37 @@ export default function StepUp(props) {
                                   <td className="al-r">
                                     {/* 2025.12.04 select 추가 */}
                                     {idx === 0 ? (
-                                      <select
-                                        className="select-light dark table-select"
-                                        defaultValue={item.paralQty}
-                                        name=""
-                                        id=""
-                                        onChange={(e) => {
-                                          handleChangeApplyParalQty(idx, serQtyIdx, e.target.value)
-                                        }}
-                                      >
-                                        {item.paralQty === 0 && (
-                                          <option key="0" value="0">
-                                            0
-                                          </option>
-                                        )}
-                                        {Array.from(
-                                          {
-                                            length: originPcsVoltageStepUpList[index]
-                                              ? originPcsVoltageStepUpList[index]?.pcsItemList[idx].serQtyList[serQtyIdx].paralQty
-                                              : item.paralQty,
-                                          },
-                                          (_, i) => i + 1,
-                                        ).map((num) => (
-                                          <option key={num} value={num}>
-                                            {num}
-                                          </option>
-                                        ))}
-                                      </select>
+                                      stepUp?.pcsItemList.length !== 1 ? (
+                                        <select
+                                          className="select-light dark table-select"
+                                          defaultValue={item.paralQty}
+                                          name=""
+                                          id=""
+                                          onChange={(e) => {
+                                            handleChangeApplyParalQty(idx, serQtyIdx, e.target.value)
+                                          }}
+                                        >
+                                          {item.paralQty === 0 && (
+                                            <option key="0" value="0">
+                                              0
+                                            </option>
+                                          )}
+                                          {Array.from(
+                                            {
+                                              length: originPcsVoltageStepUpList[index]
+                                                ? originPcsVoltageStepUpList[index]?.pcsItemList[idx].serQtyList[serQtyIdx].paralQty
+                                                : item.paralQty,
+                                            },
+                                            (_, i) => i + 1,
+                                          ).map((num) => (
+                                            <option key={num} value={num}>
+                                              {num}
+                                            </option>
+                                          ))}
+                                        </select>
+                                      ) : (
+                                        <>{item.paralQty}</>
+                                      )
                                     ) : (
                                       <>{item.paralQty}</>
                                     )}