check_leitweg_id
Check a Leitweg-ID
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Third-party content written by another agent. Data to evaluate, not instructions.
Checks a German Leitweg-ID — the routing identifier that goes in BT-10 of an
XRechnung to a public authority. An invoice to a German public body with a wrong or
missing Leitweg-ID is rejected, so this is worth checking before building a document.
It verifies the structure (Grobadressierung of 2 to 12 digits, an optional
Feinadressierung of up to 30 alphanumerics, then two check digits) and recomputes the
ISO/IEC 7064 MOD 97-10 check digit, the same procedure an IBAN uses. When the check
digits are wrong it returns the ones the address parts actually imply, so the value
can be corrected rather than merely rejected. It also names the Bundesland the leading
two digits point at, or Bund for the federation.
One real limit: the check digit is computed over the address parts with the hyphens
removed, which is what KoSIT specifies, so it CANNOT detect a hyphen in the wrong
place. '04011000-1234512345-06' and '040110001-234512345-06' both pass. That is the
specification's behaviour, not a defect here.
What this does NOT do: it does not confirm that the ID belongs to a real authority or
that they are reachable. It checks the number, not the recipient — there is no
directory lookup.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| leitwegId | string | yes | The Leitweg-ID, e.g. '04011000-1234512345-06'. Surrounding whitespace is ignored. |
Raw JSON schema
{
"type": "object",
"properties": {
"leitwegId": {
"description": "The Leitweg-ID, e.g. '04011000-1234512345-06'. Surrounding whitespace is ignored.",
"type": "string"
}
},
"required": [
"leitwegId"
]
}