BNPP Fortis asks in the e-invoicing

• StartDate AND  EndDate fields in the body of the invoice to specify the Service Period
• OrderReference:ID field to specify the Purchase Order (PO) Number. 

Important remark

We have noticed that not all software programs currently on the market support correctly these specific fields, even if they are Peppol-compliant. 

Is this the case ?  I am not a user already, but wants to start the first of january 2026.  

Thanks

stefan.