I see this error in my log some times? error: SO1000

The costumer told me, he mistaken with putting his card in the pin reader.
Perhaps all is false alarm and this error happends more often because of such simular thing.
BUT after checking database i see the user had 3x a order and 1 failed because of the user putting his card wrong and 1 was succes.
The other one is the transaction from below, but the costumer said he only tried 2 times...

I checked all the details/requests but i couldn't find any issues in it.. i will post them below:
*i changed some things because i don't want everybody to know my secret information! (such as tokens/names etc.)

If you see anything let me know, maybe it's because i changed the values for this posting...
*i only see there is time difference> 14:57 and 16:57 but that seems to happen to all my requests, i need to check php time for it also..

Transactie details:
Transactie ID: 0030000276973091
Interne transactie ID: 0000000276973091
Tijd: 11-04-2012 16:57:05
Resultaat type: Declined
Externe resultaatcode: Failure in system

Bericht details:

Txn verzoek:

<?xml version="1.0" encoding="UTF-8" ?><AcquirerTrxReq xmlns="http://www.idealdesk.com/Message" version="1.1.0"><createDateTimeStamp>2012-04-11T14:57:05.000Z</createDateTimeStamp><Issuer><issuerID>0011</issuerID></Issuer><Merchant><merchantID>003020611</merchantID><subID>0</subID><authentication>SHA1_RSA</authentication><token>Y89EF5EBD7ADB61307B9B661B1CA0D2DCD27C811</token><tokenCode>pNf0RNr0iYIKW8u1MCe2jesMP2LrgBztZahB0hNM7DSpBYCWV4Mh4GYxTsNyv1+OVND9ifAv1LaUd+7QGyWYVpr3LY824Qwv51Q/2oQZoG9Vsh1zaAP3WSE45hT0sDYQni49Ao7tzhjYq0+s+2Ff01FqrASQGIYvQ+redEYC60o=</tokenCode><merchantReturnURL>https://www.domain.com/nl/uc_ideal_pro/complete/19693</merchantReturnURL></Merchant><Transaction><purchaseID>19693</purchaseID><amount>795</amount><currency>EUR</currency><expirationPeriod>PT30M</expirationPeriod><language>nl</language><description>Bestelling 19693 (1 maanden)</description><entranceCode>31026a95c84f5c8ec0079fabdbe25ca87bb83350</entranceCode></Transaction></AcquirerTrxReq>

Txn antwoord:

<?xml version="1.0" encoding="UTF-8"?>
<ErrorRes xmlns="http://www.idealdesk.com/Message" version="1.1.0">
  <createDateTimeStamp>2012-04-11T14:57:09.873Z</createDateTimeStamp>
  <Error>
    <errorCode>SO1000</errorCode>
    	    <errorMessage>Failure in system</errorMessage>
    					    <errorDetail>System generating error: acquirer</errorDetail>
			    <consumerMessage>Betalen met iDEAL is nu niet mogelijk. Probeer het later nogmaals of betaal op een andere manier.</consumerMessage>
  </Error>
</ErrorRes>

Issuer verzoek:

<?xml version="1.0" encoding="UTF-8"?>
<IssuerTrxReq xmlns="http://www.idealdesk.com/Message" version="2.0.0">
  <createDateTimeStamp>2012-04-11T14:57:05.791Z</createDateTimeStamp>
<Acquirer>
  <acquirerID>0030</acquirerID>
</Acquirer>
<Merchant>
  <merchantID>003020611</merchantID>
  <subID>0</subID>
  <legalName>Secret</legalName>
      <merchantAccountNumber>0596657197</merchantAccountNumber>
  <merchantCity>Amsterdam</merchantCity>
  <merchantReturnURL>https://www.domain.com/nl/uc_ideal_pro/complete/19693</merchantReturnURL>
</Merchant>
<Transaction>
  <transactionID>0000000276973091</transactionID>
  <purchaseID>19693</purchaseID>
  <amount>795</amount>
  <currency>EUR</currency>
    <expirationPeriod>PT30M</expirationPeriod>
      <language>nl</language>
  <description>Bestelling 19693 (1 maanden)</description>
  <entranceCode>31026a95c84f5c8ec0079fabdbe25ca87bb83350</entranceCode>
</Transaction>
<Signature>
  <signatureValue>IRLKKSDY4+5jKAHj7new06G+PUcamtL/LPNp1izsfRmS7WsiXAzEuvAIcLs2iSplcsuU+/aMvaluwBDEF88eSe5LxxsiQmjsOIKtrQcQVS5HWOL/UVKWTLMieRZPcNgCidm8YELqlKStQudtxBBwGQccgJIu8XDgZ8iHZl/0HBk=</signatureValue>
  <fingerprint>FED518E3478CBFF3EA2244869BD3DACA1C6317A6</fingerprint>
</Signature>
</IssuerTrxReq>

Issuer antwoord:

(leeg... staat niks in!)

ok if it happends again I will contact them.