function wpf_xprofile_data_after_save( $field ) {

    if ( function_exists( 'wp_fusion' ) ) {
        wp_fusion()->user->push_user_meta( $field->user_id, array( 'bbp_field_' . $field->field_id => $field->value ) );
    }

}

add_action( 'xprofile_data_after_save', 'wpf_xprofile_data_after_save' );