@replace {{form_id}}
// Set parent for post created with APC to post on which form is embedded
add_action( 'gform_advancedpostcreation_post_after_creation_{{form_id}}',
function( $post_id, $feed, $entry, $form ) {
wp_update_post( array(
'ID' => $post_id,
'post_parent' => GFCommon::replace_variables( '{embed_post:ID}', $form, $entry )
) );
},
10, 4 );