The project reference must be provided on the invoice.
The project reference must be provided on the invoice.
Project references help the buyer allocate costs and match the invoice to a project or budget line. Use the project ID provided by the buyer (not an internal free-text label) where possible.
Add the project reference to the invoice.
<cac:ProjectReference><cbc:ID>PRJ-2025-0042</cbc:ID></cac:ProjectReference><!-- Missing cac:ProjectReference -->Validate your XRechnung files against all BR-DE rules.
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Overview of all German XRechnung validation rules.
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