In case anyone will want to do this, this is what worked for me:
In my single-my_custom_post_type.php
I replaced this line:
get_template_part('content', get_post_format());
With this one:
include 'content-spp_service_provider.php';
In case anyone will want to do this, this is what worked for me:
In my single-my_custom_post_type.php
I replaced this line:
get_template_part('content', get_post_format());
With this one:
include 'content-spp_service_provider.php';