These error messages can be resolved using this article:
Posting date is after the selected period
Document date by period
The refund is after the current period
Why can't I select the desired accounting period when exporting to DATEV?
Explanation: DATEV requires specific rules for the selection of accounting periods. Moss validates the data as follows:
Posting date for card transactions
Billing date for invoices
Submission date for refunds
The selected billing period must fulfil the following criteria:
Be the same or later than the relevant date
Be in the same financial year
If you receive an error message when exporting, please check whether the accounting period fulfils these conditions.
How can I post expenses in the period in which they are actually incurred (if this differs from the posting, invoice or submission date)?
The procedure depends on the module:
Card transactions
Moss does not allow you to manually select a specific date for the posting period.
Workaround:
Use the Advance Payments (ARAP) function to allocate costs.Example:
If the posting date is in November and the invoice date is in October:
Create an advance payment for October (1-31).
Export the transaction and the release of the advance payment separately.
Alternatively, you can adjust the postings directly in DATEV.
Invoices
Moss transmits both the service date and the invoice date to DATEV.
If the service date is outside the selected export period:
DATEV Accounting suggests moving the entry to the appropriate period.
Confirm the adjusting by clicking on each line.
Reimbursements
Moss books refunds based on the date of submission. It is not possible to change the period within Moss.
If adjustments are required, these must be made manually in DATEV Unternehmen Online or Accounting.
Why the submission date?
The submission date prevents problems with closed posting periods when expenses are submitted late. This ensures a smooth workflow.
Which year can I export to?
When exporting transactions from Moss to DATEV Unternehmen Online (DUO), it is crucial that the target year is correctly set up in DUO. This article explains which years you can export to and which requirements must be met.
Requirements for exporting to DATEV DUO
To export from Moss into a specific financial year, the following conditions must be met:
The financial year must exist in DUO
It must be created in DATEV DUO.At least one month must be open
A bookable period must be available in the respective year so that transactions can be assigned.The document or posting date must fall within that year
Moss checks the period assignment for every export based on these dates.
DATEV only allows imports with a date in the same financial and calendar year. If your financial year differs from the calendar year, DATEV also checks that the date falls into the selected calendar year.
Can I export to previous years?
Scenario A: The year exists in DUO
If the target year (e.g. 2023) has already been created in DUO, an export is generally possible – even if that year has been closed.
Transactions will be correctly assigned as long as they have a valid posting or document date.
Scenario B: The year was never created
If the desired year (e.g. 2022) was never set up in DUO, exporting to that year is not possible. DUO does not allow the creation of past financial years retroactively.
Important: Moss can only export to years that exist in DUO, including retroactively. “Backdating” transactions into non-existent years is technically impossible.
Common use cases
Target year | Exists in DUO? | Export possible? | Note |
2024 | Yes | Yes | Standard export |
2023 | Yes | Yes | Retroactive export possible |
2022 | No | No | No export - year does not exist |
2026 | Yes (accidentally created) | Yes for 2024 | Export to the current year is still possible if correctly filtered |
Notes on target year 2026:
Even if a future year like 2026 is accidentally created in DUO, an export to the correct year (e.g. 2024) is still possible. You just need to ensure that the correct year is selected during the DUO export preparation. You must carefully filter the target year.
What if the target year is missing?
If you want to export transactions to a year that does not exist in DUO, please contact your tax advisor. A manual posting in the DATEV system may still be possible — but not through the Moss export.
Related articles
If you are unsure whether your target year is set up correctly, or if your export fails, please contact our Support Team at support@getmoss.com or your tax advisor.