onValidation.js

import("system.translate");
import("Util_lib");
import("system.result");
import("system.vars");
import("Attribute_lib");

if(vars.get("$field.AB_ATTRIBUTE_ID") && !AttributeRelationUtils.validateSingleCount(
    vars.get("$param.ObjectType_param"),
    vars.get("$param.ObjectRowId_param"),
    vars.get("$field.AB_ATTRIBUTE_ID")
)) {
    result.string(translate.text("Invalid attribute count"));
}
else
{
var attributeType = AttributeTypes.get(vars.get("$field.ATTRIBUTE_TYPE"));
if (attributeType && !attributeType.useLookup)
{
    var validationResult = attributeType.validateValue(vars.get("$local.value"), Utils.parseJSON(vars.get("$field.VALIDATIONPARAMETERS")));
    if (validationResult && validationResult !== true)
    {
        result.string(validationResult);
    }
}
}