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diff --git a/FS/FS/part_fee_usage.pm b/FS/FS/part_fee_usage.pm
new file mode 100644
index 000000000..a1b85ae9d
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+++ b/FS/FS/part_fee_usage.pm
@@ -0,0 +1,130 @@
+package FS::part_fee_usage;
+
+use strict;
+use base qw( FS::Record );
+use FS::Record qw( qsearch qsearchs );
+use FS::Conf;
+
+=head1 NAME
+
+FS::part_fee_usage - Object methods for part_fee_usage records
+
+=head1 SYNOPSIS
+
+  use FS::part_fee_usage;
+
+  $record = new FS::part_fee_usage \%hash;
+  $record = new FS::part_fee_usage { 'column' => 'value' };
+
+  $error = $record->insert;
+
+  $error = $new_record->replace($old_record);
+
+  $error = $record->delete;
+
+  $error = $record->check;
+
+=head1 DESCRIPTION
+
+An FS::part_fee_usage object is the part of a processing fee definition 
+(L<FS::part_fee>) that applies to a specific telephone usage class 
+(L<FS::usage_class>).  FS::part_fee_usage inherits from
+FS::Record.  The following fields are currently supported:
+
+=over 4
+
+=item feepartusagenum - primary key
+
+=item feepart - foreign key to L<FS::part_pkg>
+
+=item classnum - foreign key to L<FS::usage_class>
+
+=item amount - fixed amount to charge per usage record
+
+=item percent - percentage of rated price to charge per usage record
+
+=back
+
+=head1 METHODS
+
+=over 4
+
+=cut
+
+sub table { 'part_fee_usage'; }
+
+sub check {
+  my $self = shift;
+
+  $self->set('amount', 0)  unless ($self->amount || 0) > 0;
+  $self->set('percent', 0) unless ($self->percent || 0) > 0;
+
+  my $error = 
+    $self->ut_numbern('feepartusagenum')
+    || $self->ut_foreign_key('feepart', 'part_fee', 'feepart')
+    || $self->ut_foreign_key('classnum', 'usage_class', 'classnum')
+    || $self->ut_money('amount')
+    || $self->ut_float('percent')
+  ;
+  return $error if $error;
+
+  $self->SUPER::check;
+}
+
+# silently discard records with percent = 0 and amount = 0
+
+sub insert {
+  my $self = shift;
+  if ( $self->amount > 0 or $self->percent > 0 ) {
+    return $self->SUPER::insert;
+  }
+  '';
+}
+
+sub replace {
+  my ($new, $old) = @_;
+  $old ||= $new->replace_old;
+  if ( $new->amount > 0 or $new->percent > 0 ) {
+    return $new->SUPER::replace($old);
+  } elsif ( $old->feepartusagenum ) {
+    return $old->delete;
+  }
+  '';
+}
+  
+=item explanation
+
+Returns a string describing how this fee is calculated.
+
+=cut
+
+sub explanation {
+  my $self = shift;
+  my $string = '';
+  my $money = (FS::Conf->new->config('money_char') || '$') . '%.2f';
+  my $percent = '%.1f%%';
+  if ( $self->amount > 0 ) {
+    $string = sprintf($money, $self->amount);
+  }
+  if ( $self->percent > 0 ) {
+    if ( $string ) {
+      $string .= ' plus ';
+    }
+    $string .= sprintf($percent, $self->percent);
+    $string .= ' of the rated charge';
+  }
+  $string .= ' per '.  $self->usage_class->classname . ' call';
+
+  return $string;
+}
+
+=back
+
+=head1 SEE ALSO
+
+L<FS::Record>, schema.html from the base documentation.
+
+=cut
+
+1;
+