importing attachments to be assigned to relevant accounts

importing attachments to be assigned to relevant accounts

Hi, we've imported our customer accounts with their unique customer codes as Account Number and as Parent Account.

When I export the Accounts data from the system, the Parent Account and Parent Account ID fields are not empty.

I have my .zip file ready with 3 test-files ready to import into the system as attachments, and obviously to be assigned to the relevant accounts.

However, after I map the fields and proceed with the import, I always get the message that the 3 records were skipped and not imported with the error message "Could not find a matching parent record for this look up field - Customer Code" 

I've tried using the Parent Account (customer code) and Parent Account ID to map to Parent ID but I still get this message after many times of trying.

I've attached:
- the account information we have imported into the system
- the csv file which we use to map the 3-test files to the customer (I have tried using Parent Account ID and Parent Account many times but neither works)
- the attachment import mapping screen

Please let me know soonest possible. I've emailed through an enquiry to support but have not had an answer.

Thanks for any help.