diff --git a/public/userarea/gridRenderer.js b/public/userarea/gridRenderer.js
index a1d0149..87cc0d1 100644
--- a/public/userarea/gridRenderer.js
+++ b/public/userarea/gridRenderer.js
@@ -242,7 +242,88 @@
         return _pendingFixed[cacheKey];
     }
 
+    async function refreshDependentFixedFieldsForRow(rowIndex) {
+        const row = data[rowIndex];
+        if (!row) return;
+
+        const clientId = row.idclient || "";
+
+        // Find fixed fields that depend on idclient
+        const dependentFields = Object.keys(fixedFieldApiConfig).filter(
+            (key) => {
+                return fixedFieldApiConfig[key].dependsOn === "idclient";
+            },
+        );
+
+        if (dependentFields.length === 0) return;
+
+        for (const fieldKey of dependentFields) {
+            // When client changes, the old responsible is no longer reliable
+            if (
+                row.fixedFields &&
+                Object.prototype.hasOwnProperty.call(row.fixedFields, fieldKey)
+            ) {
+                row.fixedFields[fieldKey] = "";
+                row._dirty = true;
+            }
+
+            // Reload options for the new client
+            if (clientId) {
+                await loadFixedFieldOptions(fieldKey, clientId);
+            }
+        }
+
+        // Re-render only this row so ClienteResponsabile select is rebuilt with the new options
+        renderSingleRow(rowIndex);
+
+        // If the first row client changes, update the top propagation select too
+        if (rowIndex === 0) {
+            await refreshTopDependentFixedSelect(
+                "ClienteResponsabile",
+                clientId,
+            );
+        }
+
+        updateDirtyIndicator();
+    }
     // ── Custom field dropdown data loading ─────────────────────────────────
+    async function refreshTopDependentFixedSelect(fieldKey, clientId) {
+        if (!topContainer || !fieldKey) return;
+
+        const sel = topContainer.querySelector(
+            `.api-fixed-select[data-fixed-key="${fieldKey}"]`,
+        );
+
+        if (!sel) return;
+
+        // Destroy Select2 if already initialized
+        if ($(sel).hasClass("select2-hidden-accessible")) {
+            $(sel).select2("destroy");
+        }
+
+        sel.innerHTML = '<option value="">Seleziona...</option>';
+
+        if (!clientId) {
+            $(sel).select2({
+                placeholder: "Seleziona...",
+                allowClear: true,
+                width: "100%",
+            });
+            return;
+        }
+
+        const items = await loadFixedFieldOptions(fieldKey, clientId);
+
+        items.forEach((item) => {
+            sel.add(new Option(item.text, item.id));
+        });
+
+        $(sel).select2({
+            placeholder: "Seleziona...",
+            allowClear: true,
+            width: "100%",
+        });
+    }
 
     // Select2 AJAX config factory for SceltaMultipla
     function sceltaSelect2Config(fieldId) {
@@ -886,23 +967,27 @@
             }
 
             if (config && config.dependsOn) {
-                // For dependent fields: merge all cached values across all clientIds
-                const allItems = new Map();
-                for (const [key, items] of Object.entries(fixedFieldCache)) {
-                    if (key.startsWith(fieldKey + "_")) {
-                        items.forEach((item) =>
-                            allItems.set(String(item.id), item),
-                        );
-                    }
-                }
+                // Dependent fixed fields, for example ClienteResponsabile:
+                // use the first row client, not all cached clients.
+                const firstClientId =
+                    data[0]?.idclient || meta.defaultIdclient || "";
+
                 sel.innerHTML = '<option value="">Seleziona...</option>';
-                [...allItems.values()]
-                    .sort((a, b) =>
-                        String(a.text).localeCompare(String(b.text), "it", {
-                            sensitivity: "base",
-                        }),
-                    )
-                    .forEach((item) => sel.add(new Option(item.text, item.id)));
+
+                if (firstClientId) {
+                    const items =
+                        fixedFieldCache[fieldKey + "_" + firstClientId] || [];
+
+                    items.forEach((item) => {
+                        sel.add(new Option(item.text, item.id));
+                    });
+                }
+
+                $(sel).select2({
+                    placeholder: "Seleziona...",
+                    allowClear: true,
+                    width: "100%",
+                });
             } else {
                 const items = fixedFieldCache[fieldKey] || [];
                 sel.innerHTML = '<option value="">Seleziona...</option>';
@@ -950,6 +1035,8 @@
             } else if (colType === "idclient") {
                 data[rowIndex].idclient = value;
                 data[rowIndex]._dirty = true;
+
+                refreshDependentFixedFieldsForRow(rowIndex);
             } else if (colType === "cliente_fornitore_id") {
                 data[rowIndex].cliente_fornitore_id = value;
                 data[rowIndex]._dirty = true;
@@ -1042,8 +1129,37 @@
             if (column === "idclient") {
                 data.forEach((row) => {
                     row.idclient = value;
+
+                    // Clear dependent fixed fields when client changes
+                    if (
+                        row.fixedFields &&
+                        Object.prototype.hasOwnProperty.call(
+                            row.fixedFields,
+                            "ClienteResponsabile",
+                        )
+                    ) {
+                        row.fixedFields["ClienteResponsabile"] = "";
+                    }
+
                     row._dirty = true;
                 });
+
+                // Reload ClienteResponsabile options for the propagated client
+                if (value) {
+                    loadFixedFieldOptions("ClienteResponsabile", value).then(
+                        () => {
+                            refreshTopDependentFixedSelect(
+                                "ClienteResponsabile",
+                                value,
+                            );
+                            renderVisibleRows();
+                            updateDirtyIndicator();
+                        },
+                    );
+                    return;
+                } else {
+                    refreshTopDependentFixedSelect("ClienteResponsabile", "");
+                }
             } else if (column === "cliente_fornitore_id") {
                 data.forEach((row) => {
                     row.cliente_fornitore_id = value;
@@ -1086,6 +1202,8 @@
             if (colType === "idclient") {
                 data[rowIndex].idclient = value;
                 data[rowIndex]._dirty = true;
+
+                refreshDependentFixedFieldsForRow(rowIndex);
             } else if (colType === "cliente_fornitore_id") {
                 data[rowIndex].cliente_fornitore_id = value;
                 data[rowIndex]._dirty = true;