diff --git a/sign_oca/static/src/components/sign_oca_pdf_portal/sign_oca_pdf_portal.esm.js b/sign_oca/static/src/components/sign_oca_pdf_portal/sign_oca_pdf_portal.esm.js
index 067cca2e..80d1a787 100644
--- a/sign_oca/static/src/components/sign_oca_pdf_portal/sign_oca_pdf_portal.esm.js
+++ b/sign_oca/static/src/components/sign_oca_pdf_portal/sign_oca_pdf_portal.esm.js
@@ -32,8 +32,10 @@ export class SignOcaPdfPortal extends SignOcaPdf {
         this.to_sign = this.to_sign_update;
         if (this.to_sign_update) {
             $(this.signOcaFooter.el).show();
+            $("#sign_oca_button").removeAttr("disabled");
         } else {
             $(this.signOcaFooter.el).hide();
+            $("#sign_oca_button").prop("disabled", true);
         }
     }
     postIframeFields() {
diff --git a/sign_oca/static/src/elements/check.esm.js b/sign_oca/static/src/elements/check.esm.js
index 839b4292..cf338f2d 100644
--- a/sign_oca/static/src/elements/check.esm.js
+++ b/sign_oca/static/src/elements/check.esm.js
@@ -53,8 +53,8 @@ const checkSignOca = {
         });
         return input;
     },
-    check: function () {
-        return true;
+    check: function (item) {
+        return Boolean(item.value);
     },
 };
 registry.category("sign_oca").add("check", checkSignOca);