When you use '+' button on a grid or scroll you get a new, empty list element. If you want to customize the object, define a function in the TabMenu's user exit file named initializeNewElement_<LIST_NAME>(newElement).
Example:
function initializeNewElement_ENRL_LOG(newElement) {
newElement.set('ENRL_LOG_TYPE_FLG', 'USER');
newElement.set('USER_INFO', parent.model.getValue('CURRENT_USER_INFO'));
}
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