WISAG exclusively accepts invoices via mail. A mailbox has been set up for this purpose. The mail address will be provided automatically once online testing has been completed successfully.

We use a valid cost center in the buyer reference field. Please head to the document library for more information.

WISAG currently supports ZUGFeRD specification 2.X as well as X-invoice according to standard EN169361. Please note, that your ZUGFeRD-invoice can only be accepted with an embedded xml-file. The xml attachment may contain one of the following terms: ZUGFeRD-invoice.xml, factur-x.xml, xrechnung.xml. Please head to the document library for more information.

In addition to the mandatory fields defined in the ZUGFeRD 2.X specification, all other WISAG- specific requirements are listed in the documentation.

Yes. Additional attachments in the common file formats may be included with the invoice mail with a file size up to 25MB. Attachments such as delivery notes and work documents can be submitted as seperate documents in the mail, embedded within the PDF or encoded in the corresponding fields of the xml-file. If multiple documents are submitted in one email, the invoice should always be the first attachment. 

Rejections are sent to the mailbox from which the invoices are originating and additionally the mail address contained in the xml field EMailURIUniversalCommunication. A rejection can be automatic (e.g. invalid format) or manual and will always contain the delivered resason of rejection. 

Please contact the responsible WISAG colleague at procurement.

Option 1: 
XML attachment is missing. The file submitted is a PDF, not a ZUGFeRD-invoice. The XML-file must be embedded in the PDF.                                                                                   
Option 2: 
Error despite exisiting xml attachment. Please make sure the xml-file contains one of the following names: 
1. ZUGFeRD-invoice.xml
2. factur-x.xml
3. xrechnung.xml
Alternative names can not be recognized and therefore will be reported back as a missing element.

If a document with an identical document number is already in approval, please wait until final rejection before submitting the invoice again, e.g. to submit missing delivery notes etc.

The information on the document type is a mandatory information and can be delivered via code in the xml field “HeaderExchangedDocument”. The currently accepted document types include:

Typ Code          Description

380                   commercial invoice

381                   credit note

384                   corrected invoice

386                   partial final construction invoice

326                   partial invoice

84                     credit note

389                   credit note procedure

 The code for regular commercial invoices across all formats is code 380.

3.1. "Validate BuyerOrderReference"                           

BuyerReference= BuyerOrderReference= BuyerOrderReferencedDocument (all terms have the same meaning)
Cost Center is incorrect or missing.

Possible reasons: 
- invalid CostCenter
- wrong format: blanks between numbers, additional words, numbers etc. 
Please only use the number when filling in this field!

3.2. “Invalid BuyerTradeParty”

Possible reasons:
- company name in xml  not identical with pdf
- company name incomplete/ contains abbreviations (both are not allowed)

Once the sample invoice has been approved by our system, electronic invoicing can be initiated. Please note, that all digital invoices will exclusively accepted via the mail address provided to you after successful verification. Invoices sent to alternative adresses can not be processed! If you have questions regarding this process, please contact your responsible WISAG contact person.

Your invoice has not been rejected. The supplier number is not a mandatory information and your invoice can be processed without it. If possible, please provide your supplier number in the xml field SellerTradeParty as it speeds up the automatic assignment processes.