//change 'CPT' to the name
//change "location" to the CPT slug
//will display custom text for the placeholder for the CPT title in editor
function change_default_CPT_title( $enter_title_here, $post ){
if ( isset($post->post_type) && 'location' == $post->post_type ) {
$enter_title_here = "Enter the CPT's name";
}
return $enter_title_here;
}
add_filter( 'enter_title_here', 'change_default_CPT_title', 11, 2 );