Error codes · KSeF 2.0 · Poland
KSEF-21182Partly
KSeF concurrent export limit reached
This is the rejection, word for word: „[KSEF-21182] The KSeF 2.0 API rejected your invoice export request because the authenticated entity already has the maximum number of concurrent exports in flight. The message returned is "Osiągnięto limit trwających eksportów" (concurrent export limit reached).“
KSeF 2.0 enforces a per-context ceiling on the number of simultaneously running invoice-export operations (POST /invoices/export, /invoices/export/async and related endpoints). Once the ceiling is hit, further export requests return HTTP 429 with body code 21182 until at least one running export finishes. The limit is per authenticated entity — not per token — so opening more tokens does not raise the ceiling.
What to have readyThe correct figures from your bookkeeping; we show you which field is affected.
What we doSerialise export jobs. Wait for a running export to finish (poll the status endpoint) before starting the next one.
What the finding looks likeExample
FindingNeeds your check · KSEF-21182
From youThe correct figures
ThenChecked again
ProofSHA-256 and /verify link after the check