Your SAP Invoice
Will Get Rejected —
Find Out Why Before Submission.
Avoid costly rejections with our SAP invoice validation tool and invoice compliance checker. As a leading SAP invoice validator and invoice validator SAP, Readix provides pre-flight e-invoice validation and readiness for SAP consultants across the DACH region & Poland. Upload your XML or PDF. Get a field-by-field compliance report before KSeF or XRechnung rejects your invoice.
Average time fixing mappings
Consultant hours × rework
Plus VAT deduction loss
Three Steps to SAP Invoice Validation
Our SAP invoice validator workflow validates your configuration during design and before go-live
Master Data Mapping
Validate your SAP Vendor Master data against customer-specific e-invoicing portals (IDoc to UBL/KSeF).
Pre-Flight Check
Automated readiness report for your e-invoice XML or PDF exports. Pass gov hurdles on Day 1.
Supported E-Invoicing Standards
Click to view our detailed validation guides for each region
"People who work on this issue are more than willing to pay to save time instead of working weeks on mappings back and forth with the customer."
— Marlies Schröder · SAP S/4HANA SD Consultant"Our ERP basically treats XRechnung like a foreign language."
— SAP consultant · r/Accounting"I imported an XRechnung with a wrong VAT. It imported without any warning."
— Developer · r/Odoo"You're still babysitting every invoice anyway. OCR was 70% accurate on a good day."
— r/Accounting"Everything I found was either too complicated or too expensive."
— r/selbststaendig"People who work on this issue are more than willing to pay to save time instead of working weeks on mappings back and forth with the customer."
— Marlies Schröder · SAP S/4HANA SD Consultant"Our ERP basically treats XRechnung like a foreign language."
— SAP consultant · r/Accounting"I imported an XRechnung with a wrong VAT. It imported without any warning."
— Developer · r/Odoo"You're still babysitting every invoice anyway. OCR was 70% accurate on a good day."
— r/Accounting"Everything I found was either too complicated or too expensive."
— r/selbststaendig
"I built Readix after seeing SAP consultants lose weeks to XRechnung mapping errors discovered after go-live. Every critical field in our validator comes from a real project failure. This is the tool I wish existed."
Muralidharan K
CEO & Founder, Readix / Evidra ·LinkedIn →
EU e-invoicing mandates are live.
Ready to Validate Your SAP Invoice?
Trust the leading SAP invoice validator. The mandate is live. Is your SAP configuration ready?
Per-Analysis Rate
Most consultants upgrade after their first report
- 24h turnaround
- Full PDF report
- Email support
Common Questions
What is XRechnung and who must comply?
XRechnung is Germany's mandatory e-invoicing standard based on UBL 2.1. Since January 2025, all large German B2B companies must issue and receive XRechnung-compliant invoices. SMEs follow in 2026–2027 under the Wachstumschancengesetz.
What is KSeF and when is it mandatory in Poland?
KSeF (Krajowy System e-Faktur) is Poland's national e-invoicing platform. It became mandatory for large taxpayers in 2024 and will be mandatory for all Polish businesses in 2026. All invoices must be submitted through the KSeF portal in structured XML format.
How does Readix differ from the free KoSIT validator?
KoSIT validates your final XML output. Readix validates the SAP configuration — IDoc mappings, Vendor Master fields, Customer-Vendor setup — that produces the XML. KoSIT catches schema errors after the fact. Readix catches mapping errors before go-live.
What SAP fields cause XRechnung rejection most often?
The three most common rejection fields are: Leitweg-ID (BT-10) — routing identifier missing or malformed; VAT number (BT-48) — wrong format or not linked in Vendor Master (LFB1); Process identifier (BT-23) — missing or incorrect in IDoc header mapping.
How long does a Readix analysis take?
24 hours. Upload your invoice XML or PDF, and receive a field-by-field compliance report within one business day. The first analysis is free — no credit card required.
Is my invoice data retained after analysis?
No. Invoice data is deleted immediately after analysis is complete. We process your file to generate the compliance report, then it is gone. See our Privacy Policy for full details.
Wondering about free validators? See how pre-flight validation differs from XML validators →