OTM 9.5 – enhanced e-invoicing and billing document management
- Electronic invoicing in OTM 9.5
- Choose your output: PDF, XML or ZIP
- Advance payments, corrections and cancellations
- Document numbers and related versions
- Agency defaults and recipient-specific settings
- Project documents and accounting at a glance
- Two billing workflows in the resource portal
- Record follow-up transactions after project completion
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Electronic invoicing in OTM 9.5
Feature reference: OTM 9.5, dated 17 October 2026.
With OTM 9.5, all invoices and resource billing documents generated in OTM are electronic invoices using the updated standard. Output uses ZUGFeRD 2.5.2 / Factur-X 1.09.2, with the EN 16931 profile for regular B2B invoices.
Validation uses the official XSD files, Schematron rules and code lists for version 2.5.2.
Choose your output: PDF, XML or ZIP
Factur-X/ZUGFeRD combines a readable PDF with embedded XML invoice data. XRechnung is available as a standalone XML file. A third option creates a ZIP file containing both formats.
Choose the format to match the recipient’s requirements. An ordinary PDF without structured invoice data is not an equivalent electronic invoice.
Advance payments, corrections and cancellations
The extended document types provide a clear record of changes. Correcting an invoice, cancelling it in full and issuing a partial credit note are distinct actions:
| Document type | Identifier | Function |
|---|---|---|
| Advance payment invoice | XXXZ | A fixed amount or percentage. Advance payments received are credited against the final invoice. |
| Correction invoice | -B | A separate, traceable version referencing the original. Earlier versions remain available. |
| Cancellation invoice / cancellation or adjustment document | -S | A separate linked document cancelling an invoice or self-billed resource invoice; distinct from a partial credit note. |
Document numbers and related versions
The numbers below are examples from the update information. They illustrate the identifiers for document types, corrections and cancellations; they do not represent a single chain of transactions.
| Document type / variant | Example number |
|---|---|
| Prepayment / payment request | XXXV26101039 |
| Advance payment invoice | XXXZ26101367 |
| Corrected advance payment invoice | XXXZ26101354-B1 |
| Cancellation of an advance payment invoice | XXXZ26101354-S |
| Partial invoice | XXXT26101369 |
| Corrected partial invoice | XXXT26101349-B2 |
| Cancellation of a partial invoice | XXXT26101361-S |
| Final invoice | XXXA26101371 |
| Corrected final invoice | XXXA26101370-B1 |
| Cancellation of a final invoice | XXXA26101368-S |
| Customer credit note / partial credit note | XXXD261050 |
| Agency-issued self-billed resource invoice | XXXN26001033 |
| Cancellation of a self-billed resource invoice | XXXN26001027-S |
Agency defaults and recipient-specific settings
Set default output formats for customer and resource documents under Administration → Settings → Accounts receivable and Administration → Settings → Accounts payable.
In PM → Customer administration, you can override the defaults for each customer and each alternative invoice recipient. New structured recipient fields include the electronic invoicing address and buyer reference.
Project documents and accounting at a glance
Originals, corrections and cancellation documents retain clear links to one another. Each version can be downloaded separately, with customer and resource documents shown in separate areas. The expanded views support day-to-day invoice processing:
| Area | New or enhanced |
|---|---|
| PM → Project documents | Originals, corrections and cancellation documents with clear references and a separate download for each version. Separate areas for customer and resource documents. |
| PM → Customer invoice | Corrections, cancellations and customer credit notes within the existing invoicing workflow. |
| Accounting → Invoices / Resource billing documents | Up-to-date document numbers and payment status. New document types in search and export, with access to document details for authorised users. |
| Accounting → Invoices / Resource billing documents → Document details | An overview of amounts, outstanding balances and related documents. Payment, early-payment discount, refund, cancellation and sending actions according to user permissions, plus a shared history. |
Two billing workflows in the resource portal
OTM supports both agency self-billing and invoices issued by resources themselves. In both workflows, the output format follows the agency’s settings.
A self-billed resource invoice settles the resource’s services on their behalf. It is not the same as a customer credit note or a partial credit against a customer invoice.
| Area | Available actions |
|---|---|
| Resource portal → Jobs → Self-billed invoices (agency self-billing) | View documents received from the agency, including details, status, related documents and downloads. Resources cannot post payments here. |
| Resource portal → Own invoices (resource-issued billing) | Preview, issue, send and cancel the resource’s own invoices. A shared detail view includes the document history. |
Record follow-up transactions after project completion
Alongside corrections, cancellation documents and customer credit notes, you can record amounts actually refunded and correct payments entered in error. This provides a more complete record of transactions after a project has closed.
The distinction matters: a refund entry records money actually paid back; a reversal entry corrects an incorrectly recorded payment.
| Situation | Action in document details |
|---|---|
| Money actually paid back | Record refund |
| Correct a payment entered in error | Reversal entry |


















