`XSD-DATATYPE`

InvoiceIn checks · validation rule

InvoiceIn checksError

An element value does not match its schema data type: e.g. a date not in YYYY-MM-DD (UBL) or YYYYMMDD (CII), an amount with a comma or thousands separator, a non-numeric quantity, a boolean other than true/false, or text exceeding the allowed length/pattern. Fix the value.

Field: (XML element named in the message)
Rule set: InvoiceIn checks
Who has to fix it: The sender

This is a property of the file you received, so it cannot be corrected on your side without changing the document — ask the supplier to reissue it.

Worked example · FA(3)

P_1 (issue date) is an xs:date in the FA(3) schema: ISO 8601 YYYY-MM-DD, not the Polish day.month.year notation.

Fails this rule

<P_1>15.02.2026</P_1>

Passes

<P_1>2026-02-15</P_1>

Check your own invoice

Drop the file that failed. We parse it, run the official rule sets against it and list every finding with a fix — 20 invoices per day, no key, nothing stored.

Open the live demo

Same explanation over the API: GET /v1/rules/XSD-DATATYPE?lang=en