Dear BS Support,
Yes you can
https://apidocs.rnd.mendix.com/8/client/mendix_lib_ObjectValidation.html
A Sample from mx 8.10.1
/**
* @param {MxObject} inputObject
* @param {string} attribute
* @param {string} message
* @returns {Promise.<void>}
*/
export async function JSA_Validate(inputObject, attribute, message) {
// BEGIN USER CODE
let validation = new mendix.lib.ObjectValidation(inputObject.getGuid(), {[attribute]: message});
mx.data.sendValidationUpdates([validation]);
// END USER CODE
}
Please be aware the sendValidationUpdates is undocumented, and therefore unsupported and is subject to change.
Though why are you not using the Nanoflow Validation Feedback action?
Cheers, Andries