A message from the party who received an original message, to the party who issued the original message, to acknowlegde to the message issuer the receipt of the original message by the recipient’s application and to ackowlegde errors made during the processing within the application.

 A message which is first processed at translator level to detect syntax errors and to aknowlegde its receipt (CONTRL) is then transmitted to the receiving application to be processed. Upon reaching this state the receiving application may issue an aknowlegdement confirming receipt of the message by the application.

The picture below shows the difference between the CONTRL message and APERAK:

The APERAK message should be generated by the application software NOT by an EDI-translator software.

The APERAK message must NOT be used to acknowlegde the receipt of an interchange.

Parties as stated in the message which is being acknowlegded, must be mentioned in the APERAK. Such parties are not the sender and the receiver identified at the interchange level.

Example with an INVOIC message: