return 0 if !$a_num_cust_svc && !$b_num_cust_svc;
return -1 if $a_num_cust_svc && !$b_num_cust_svc;
return 1 if !$a_num_cust_svc && $b_num_cust_svc;
return 0 if !$a_num_cust_svc && !$b_num_cust_svc;
return -1 if $a_num_cust_svc && !$b_num_cust_svc;
return 1 if !$a_num_cust_svc && $b_num_cust_svc;
my @a_cust_svc = $a->cust_svc_unsorted;
my @b_cust_svc = $b->cust_svc_unsorted;
return 0 if !scalar(@a_cust_svc) && !scalar(@b_cust_svc);
my @a_cust_svc = $a->cust_svc_unsorted;
my @b_cust_svc = $b->cust_svc_unsorted;
return 0 if !scalar(@a_cust_svc) && !scalar(@b_cust_svc);