Hi @Iro_
You can only achieve that via JavaScript , we have a similar use case when we have a subgrid on Advanced Form that we needed customers to MUST add at least one line and we are using the below code on Advanced Form (ex Web Form) step JS section.
lets assume the subgrid div id is ReselletCert
if (window.jQuery) {
(function ($) {
if (typeof (webFormClientValidate) != 'undefined') {
var originalValidationFunction = webFormClientValidate;
if (originalValidationFunction && typeof (originalValidationFunction) == "function") {
webFormClientValidate = function() {
originalValidationFunction.apply(this, arguments);
var rows = $("#ResellerCert tr").length;
if (rows <= 1){
alert("Please enter at least one reseller certificate to proceed.");
return false; // to prevent the form submit you need to return false
// end custom validation.
}
return true;
};
}
}
}(window.jQuery));
}
to find your subgid id, use Chrome developor tool to inspect and replace "ResellerCert" with your subgrid id
