| AA | Interactive, perform sell |
| This sub-function is to notify the receiver that the purpose of the message is an instruction to perform a sell. |
| AB | Interactive, modify current dialogue data |
| This sub-function is to notify the receiver that the message data is a modification to data previously sent in the current interactive dialogue. |
| AC | Interactive, modify previous dialogue data |
| This sub-function is to notify the receiver that the message data is a modification to data sent in a previous interactive dialogue. |
| AD | Interactive, cancel reserved product |
| This sub-function is to notify the receiver that the purpose of the message is to cancel a product previously reserved in an interactive dialogue. |
| AE | Interactive, ignore reserved product |
| This sub-function is to notify the receiver that the purpose of the message is to ignore a product previously reserved in an interactive dialogue. |
| AF | Interactive, conclude current reservation |
| This sub-function is to notify the receiver that the purpose of the message is to conclude the current reservation transaction. |
| AG | Interactive, display reserved product |
| This sub-function is to notify the receiver that the purpose of the message is to display a product previously reserved in an interactive dialogue. |
| AH | Interactive, perform reference sell |
| This sub-function is to notify the receiver that the purpose of the message is an instruction to perform a sell, based on data returned in a previous interactive response. |
| AI | Interactive, modify previous dialogue reservation |
| This sub-function is to notify the receiver that the purpose of the message is to modify a reservation, made during a previous interactive dialogue. |
| AJ | Interactive, display voucher template |
| This sub-function is to notify the receiver that the purpose of the message is to display the template for a voucher. |
| AK | Interactive, print voucher |
| This sub-function is to notify the receiver that the purpose of the message is to print a voucher. |
| AL | Interactive, cancel current dialogue reservation |
| This sub-function is to notify the receiver that the purpose of the message is to cancel a reservation made during the current interactive dialogue. |
| AM | Interactive, cancel previous dialogue reservation |
| This sub-function is to notify the receiver that the purpose of the message is to cancel a reservation made during a previous interactive dialogue. |
| AN | Interactive, duplicate sell message |
| This sub-function is to notify the receiver that the message is a duplicate of a previously sent interactive sell message. |
| AO | Interactive, duplicate modify current dialogue data |
| This sub-function is to notify the receiver that the message is a duplicate of a previously sent message to modify data in the current interactive dialogue. |
| AP | Interactive, duplicate modify previous dialogue reservation |
| This sub-function is to notify the receiver that the message is a duplicate of a previously sent message to modify a reservation made during a previous interactive dialogue. |
| AQ | Interactive, availability request, multiple suppliers |
| This sub-function is to notify the receiver that the message is an interactive request for availability which is simultaneously being sent to multiple suppliers. |
| AR | Interactive, availability request, one specific supplier |
| This sub-function is to notify the receiver that the message is an interactive request for availability from only one specific supplier. |
| AS | Interactive, product rules request |
| This sub-function is to notify the receiver that the message is an interactive request for product rules. |
| SECACK | Security acknowledgment |
| This sub-function of the AUTACK message is for the secure acknowledgement of receipt, including the reporting of any associated security violation(s). |
| SECAUT | Security authentication and/or non-repudiation of origin |
| This sub-function of the AUTACK message is for secure integrity, authentication and/or non-repudiation of origin. |
