Some of HMRC's FBI receipts start "HMRC has received the HMRC-SA-SA100 document ref ...." but some state HMRC-SA-SA100-ATT. What does the "ATT" suffix mean?
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I am reliably informed it stands for Action - To Trash.
It only happens on some returns. I don't know what the criteria is for labelling such returns as Trash.
It is the message class, which tells the gateway how to validate the contents of the submission:
HMRC-SA-SA100 (SA100 without attachments)
HMRC-SA-SA100-ATT (SA100 with attachments)
HMRC-SA-SA800 (SA800 without attachments)
HMRC-SA-SA800-ATT (SA800 with attachments)
HMRC-SA-SA900 (SA900 without attachments)
HMRC-SA-SA900-ATT (SA900 with attachments)
The SA100 is the main body of the personal tax return.
Perhaps if you also submit a supplementary page (Employment Income page, UK Rental pages etc.) that counts as an attachment and it doesn't necessarily mean that a PDF file has been attached?