Credit card payment with eway returns "invoice number not found" on BC

Question

dear all,
I am currently working on the payment gateway of pared.com.au. the problem we're having is that every credit card payment gets redirected to the "Credit Card Payment Fail" page, although the payment was marked as successful on eway.
eway transaction details stated "response code: 00", response text "transaction approved".
however, the CC payment fail page stated:
"there was an error processing your credit card. please correct this and try again.
invoice number not found: . please go back and correct this."
strangely enough, the order is perfectly recorded as successful order in BC (customers -> orders).
any help would be much appreciated - i've been looking at this for hours but i'm getting nowhere. thanks everyone!
please find the checkout page HTML below for reference (country selection omitted to save space):
<form id="catwebformform42059" name="catwebformform42059" onsubmit="return checkWholeForm42059(this)" action="/FormProcessv2.aspx?WebFormID=10850&amp;OID={module_oid}&amp;OTYPE={module_otype} &amp;EID={module_eid}&amp;CID={module_cid}&amp;CC={module_urlcountrycode}&amp;Referrer={mo dule_siteurl,true,true}&amp;SAR=False&amp;PageID=/thankyou.html" method="post" enctype="multipart/form-data">
    <div class="form">
    <div id="step1">
    <div class="item"><label>Title</label><br />
    <select class="cat_dropdown_smaller" id="Title" name="Title">
    <option value="3" selected="true">MISS</option>
    <option value="1">MR</option>
    <option value="2">MRS</option>
    <option value="4">MS</option>
    </select> </div>
    <div class="item"><label>First Name</label><br />
    <input type="text" class="cat_textbox" id="FirstName" maxlength="255" name="FirstName" /> &bull; </div>
    <div class="item"><label>Last Name</label><br />
    <input type="text" class="cat_textbox" id="LastName" maxlength="255" name="LastName" /> &bull; </div>
    <div class="item"><label>Email</label><br />
    <input type="text" class="cat_textbox" id="EmailAddress" maxlength="255" name="EmailAddress" /> &bull; </div>
    <div class="item"><label>Company</label><br />
    <input type="text" class="cat_textbox" id="Company" maxlength="255" name="Company" /> </div>
    <div class="item"><input type="button" name="next2" value="Next" onclick="display_next2();" /></div>
    </div>
    <div id="step2" style="display: none;">
    <div class="item"><label>Shipping Address</label><br />
    <input type="text" class="cat_textbox" id="ShippingAddress" maxlength="500" name="ShippingAddress" /> </div>
    <div class="item"><label>City</label><br />
    <input type="text" class="cat_textbox" id="ShippingCity" maxlength="255" name="ShippingCity" /> </div>
    <div class="item"><label>State</label><br />
    <input type="text" class="cat_textbox" id="ShippingState" maxlength="255" name="ShippingState" /> </div>
    <div class="item"><label>Zipcode/Postcode</label><br />
    <input type="text" class="cat_textbox" id="ShippingZip" maxlength="255" name="ShippingZip" /> </div>
    <div class="item"><label>Country</label><br />
    <select class="cat_dropdown" id="ShippingCountry" name="ShippingCountry">
    <option selected="true">-- Select Country --</option>
    </select> </div>
    <div class="item"><input type="button" name="next3" value="Next" onclick="display_next3();" />  <input type="button" name="back3" value="Back" onclick="display_back3();" /></div>
    </div>
    <div id="step3" style="display: none;">
    <div class="item"><input type="checkbox" id="sameas_shipping" name="sameas_shipping" value="1" onchange="handleChange(this.value);" />  Billing is same as Shipping<br />
    <div class="item"><label>Billing Address</label><br />
    <input type="text" class="cat_textbox" id="BillingAddress" maxlength="500" name="BillingAddress" /> </div>
    <div class="item"><label>City</label><br />
    <input type="text" class="cat_textbox" id="BillingCity" maxlength="255" name="BillingCity" /> </div>
    <div class="item"><label>State</label><br />
    <input type="text" class="cat_textbox" id="BillingState" maxlength="255" name="BillingState" /> </div>
    <div class="item"><label>Zipcode/Postcode</label><br />
    <input type="text" class="cat_textbox" id="BillingZip" maxlength="255" name="BillingZip" /> </div>
    <div class="item"><label>Country</label><br />
    <select class="cat_dropdown" id="BillingCountry" name="BillingCountry">
    <option>-- Select Country --</option>
    </select> </div>
    <div class="item"><input type="button" name="next4" value="Next" onclick="display_next4();" />  <input type="button" name="back4" value="Back" onclick="display_back4();" /></div>
    </div>
    </div>
    <div id="step4" style="display: none;">
    <div class="item"><label>Work Phone Number</label><br />
    <input type="text" class="cat_textbox" id="WorkPhone" maxlength="255" name="WorkPhone" /> </div>
    <div class="item"><label>Shipping Instructions</label><br />
    <textarea class="cat_listbox" id="ShippingInstructions" name="ShippingInstructions" cols="5"></textarea> </div>
    <div class="item"><input type="button" name="next5" value="Next" onclick="display_next5();" />  <input type="button" name="back5" value="Back" onclick="display_back5();" /></div>
    </div>
    <div id="step5" style="display: none;">
    <div style="width: 100%; float: left;">
    <div style="width: 52%; float: left;">
    <div id="paymentdiv">
    <div class="item"><label>Name on Card</label><br />
    <input type="text" class="cat_textbox" id="CardName" name="CardName" /> &bull; </div>
    <div class="item"><label>Card Number</label><br />
    <input type="text" class="cat_textbox" id="CardNumber" name="CardNumber" /> &bull; </div>
    <div class="item"><label>Card Expiry</label><br />
    <select class="cat_dropdown_smaller" id="CardExpiryMonth" name="CardExpiryMonth">
    <option value="1" selected="true">Jan</option>
    <option value="2">Feb</option>
    <option value="3">Mar</option>
    <option value="4">Apr</option>
    <option value="5">May</option>
    <option value="6">Jun</option>
    <option value="7">Jul</option>
    <option value="8">Aug</option>
    <option value="9">Sep</option>
    <option value="10">Oct</option>
    <option value="11">Nov</option>
    <option value="12">Dec</option>
    </select><select class="cat_dropdown_smaller" id="CardExpiryYear" name="CardExpiryYear">
    <option selected="true" value="2012">2012</option>
    <option value="2013">2013</option>
    <option value="2014">2014</option>
    <option value="2015">2015</option>
    <option value="2016">2016</option>
    <option value="2017">2017</option>
    <option value="2018">2018</option>
    <option value="2019">2019</option>
    <option value="2020">2020</option>
    <option value="2021">2021</option>
    </select> &bull; </div>
    <div class="item"><label>Card Type</label><br />
    <select class="cat_dropdown" id="CardType" name="CardType">
    <option value="1" selected="true">Visa</option>
    <option value="2">Master Card</option>
    <option value="3">Bank Card</option>
    <option value="4">American Express</option>
    <option value="5">Diners Club</option>
    <option value="6">JCB</option>
    </select> &bull; </div>
    <div class="item"><label>CCV Number</label><br />
    <input type="text" class="cat_textbox" id="CardCCV" name="CardCCV" /> &bull; </div>
    </div>
    <!-- paymentdiv -->
    <div class="item"><label>Amount</label><br />
    <input type="text" class="cat_textbox" id="Amount" name="Amount" /> &bull; </div>
    <div class="item"><input type="submit" class="cat_button" id="catwebformbutton" value="Submit" />  <input type="button" name="back6" value="Back" onclick="display_back6();" /></div>
    </div>
    <div style="width: 47%; float: right;">
    <div class="item"><label>Payment Method</label><br />
    <input type="radio" class="PaymentMethodType" onclick="ShowCCFields(this.value);" checked="true" value="1" name="PaymentMethodType" />Credit Card<br />
    <input type="radio" class="PaymentMethodType" onclick="ShowCCFields(this.value);" value="5" name="PaymentMethodType" />PayPal<br />
    </div>
    <div class="item"><img alt="GlobalSign SSL Site Seal" src="/CatalystImages/globalsign-ssl-site-seal.gif" /> </div>
    </div>
    </div>
    </div>
    <script type="text/javascript" src="/CatalystScripts/ValidationFunctions.js"></script>
    <script language="javascript" type="text/javascript">
               //<![CDATA[
               var submitcount42059 = 0;function checkWholeForm42059(theForm){var why = "";if (theForm.FirstName) why += isEmpty(theForm.FirstName.value, "First Name");if (theForm.LastName) why += isEmpty(theForm.LastName.value, "Last Name"); if (theForm.EmailAddress) why += checkEmail(theForm.EmailAddress.value); if (!theForm.PaymentMethodType || getRadioSelected(theForm.PaymentMethodType) == 1) { if (theForm.CardName) why += isEmpty(theForm.CardName.value, "Name on Card"); if (theForm.CardNumber) why += isNumeric(theForm.CardNumber.value, "Card Number"); if (theForm.Amount) why += isCurrency(theForm.Amount.value, "Amount"); } if (theForm.PaymentMethodType) why += checkSelected(theForm.PaymentMethodType, "Payment Method");if(why != ""){alert(why);return false;}if(submitcount42059 == 0){submitcount42059++;theForm.submit();return false;}else{alert("Form submission is in progress.");return false;}}
               // Credit Card info is not required if paying by PayPal, Hosted Credit Card, COD etc
               function ShowCCFields(val) {
                   if (!document.getElementById('paymentdiv'))
                         return; 
                   if (val != 1)
                         document.getElementById('paymentdiv').style.display = 'none';
                   else
                         document.getElementById('paymentdiv').style.display = 'inline';
               //]]>
         </script>
    </div>
</form>
</div>

Answer 1

This answer from Support cured the problem...
Gaurav Sharma (Adobe Business Catalyst Support)
Feb 20 04:12 (EET)
Thank you for contacting us!
I just see your online shop purchase form, which contains update credit card fields,
http://screencastmb.worldsecuresystems.com/img/2013-02-20_1309.png
As per the field description, it's used fo rupdating CC details, not for purchases.
Remove that system field and reinsert the form, and it should then work
Kind Regards