question

In Sandbox I created a charge using the Ecommerce API, paid is true and the status is succeeded.

However when I go to refund it, I get the below response:

{
    "message": "400 Bad Request",
    "error": {
        "code": "processing_error",
        "message": "Could not void/return transaction: EC000 - XML Validation Error: /GMF/CreditRequest/CommonGrp/POSEntryMode | POSEntryMode | com/firstdata/Merchant/gmfV7.06 | value '01' does not match regular expression facet '[0-9]{3,3}'"
    }
}