The field transaction_export_id
corresponds to the field BON_ID of the DSFinV-K legal documentation and is described as follows:
The BON_ID is a unique identifier for all processes. It is issued by the cash register being used and is always consecutive.
The BON_ID must be issued in an automated and unalterable way for each individual
slip in the cash register. It should be issued in a numerically ascending form.
Please note that the field should not contain the tx_id
of the transaction from SIGN DE.
The field first_transaction_export_id
corresponds to Z_START_ID of the DSFinV-K (i.e. BON_ID of the first transaction of the cashPointClosing).
The field last_transaction_export_id
corresponds to Z_ENDE_ID of the DSFinV-K (i.e. BON_ID of the last transaction of the cashPointClosing).
Good examples and explanations of the different fields and business cases can be found in the DSFinV-K documents of the Federal Central Tax Office (Bundeszentralamt für Steuern):
DSFinV-K 2.3 (EN)
DSFinV-K 2.4 (DE).