Hi @Peter Bishop ,
May I know what's your source type? If it is flat file source, you may change it from Flat File Connection Manager like shown.
Use Derived Column task with (DT_STR,50,20127)[col1] should also work, check the length of the source data or add the length to see if it could resolve the issue.
Try to redirect the 'error' rows to a separate file and then inspect them manually.
You may also refer to converting-flat-file-8859-1-encoding-to-ole-db-destination-using-codepage-1252 to see if it is helpful.
Regards,
Zoe
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