title: SSIS error - value violated the schema's constraint for the column
body: <p>Exporting from sql server to excel with ssis.  export gets around 80% through writing to the excel file then fails with this error.  It stops at the same row each time.  The value in the field being written is the well within the length parameter and contains no funky characters.  Because 35 rows pass through successfully and write to the excel file, I assume the data type is correct (nvarchar(max) in sql server, DT_WSTR(4000) in SSIS). What other things can trigger this error?  Using SSIS 2008, excel 2007 output file.</p>
  
  <p>Error message:</p>
  
  <blockquote>
    <p>Error: 0xC0202009 at Data Flow Task 1, Excel Destination [1380]: SSIS Error Code DTS_E_OLEDBERROR.  An OLE DB error has occurred. Error
    code: 0x00040EDA. Error: 0xC020901C at Data Flow Task 1, Excel
    Destination [1380]: There was an error with input column "Chemicals"
    (1454) on input "Excel Destination Input" (1391). The column status
    returned was: "The value violated the schema's constraint for the
    column.".</p>
    
    <p>Error: 0xC0209029 at Data Flow Task 1, Excel Destination [1380]:
    SSIS Error Code DTS_E_INDUCEDTRANSFORMFAILUREONERROR.  The "input
    "Excel Destination Input" (1391)" failed because error code 0xC0209076
    occurred, and the error row disposition on "input "Excel Destination
    Input" (1391)" specifies failure on error. An error occurred on the
    specified object of the specified component.  There may be error
    messages posted before this with more information about the failure.</p>
    
    <p>Error: 0xC0047022 at Data Flow Task 1, SSIS.Pipeline: SSIS Error
    Code DTS_E_PROCESSINPUTFAILED.  The ProcessInput method on component
    "Excel Destination" (1380) failed with error code 0xC0209029 while
    processing input "Excel Destination Input" (1391). The identified
    component returned an error from the ProcessInput method. The error is
    specific to the component, but the error is fatal and will cause the
    Data Flow task to stop running.  There may be error messages posted
    before this with more information about the failure.</p>
  </blockquote>