<p>Each report has its own parameters, most of which are common to all reports.  These are
normally set using the <span class="reference">Report's selection criteria</span> window
and is different for each one.</p>

<p>You can override a <span class="reference">Report's selection criteria</span> by adding parameters to a special
section in the main configuration file.  This means that, although a
user may set a specific parameter in the report selection criteria
window, it will be overwritten by that set in the main configuration
file.  This allows you to fix certain settings, for example the
<span class="keyword">percentage mark-up</span> in a billing report.</p>

<p>Each report has its own ID number - the billing report has an ID of 2.  
This corresponds to the setting in the main configuration file that you need to alter.</p>

<p>As an example, let's fix the % mark-up in every billing report to 
50% and set the surcharge to £1.00.</p>

<p>Edit the main configuration file via the Set-up screen, and in the 
section entitled <span class="keyword">[Report Customisations]</span>, add or amend the line  <span class="keyword">Report2Extra</span> to read:</p>

<p><span class="keyword">Report2Extra = &markup=50&surcharge=1.00</span></p>

<p>From now on, when a billing report (ID = 2) is run, these extra settings are forced upon
the reporting engine and override any values that the user selected.</p>