String path = pathExpression.getPath(index);
Object mapping = helper.getMappingNamed(managedType, path);
// Not resolvable
if (mapping == null) {
addProblem(pathExpression, UpdateItem_NotResolvable, pathExpression.toParsedText());
valid = false;
break;
}
// A collection mapping cannot be traversed or a value cannot be assigned to it
else if (helper.isCollectionMapping(mapping)) {