Not as compact as the answer of mr.nick. This might be an advantage or not, you decide ..
use strict;
use warnings;
my $print_flag = 'N';
while (<DATA>) {
if ($print_flag eq 'Y') {
print;
$print_flag = 'N';
}
$print_flag = 'Y' if m/^Customer ID: Yes/;
}
__DATA__
Customer ID: none
VT : 002/89
Customer ID: Yes
VT: 001/89
Customer ID: none
VT: 006/85
Customer ID: Yes
VT: 003/56
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