# BR-KSA-F-06-C1

Source: https://xmlvalid.com/rules/BR-KSA-F-06-C1

> Field character limits for Invoice number field (BT-1) have not been met. The minimum limit is 1 character and the maximum limit is 127 characters.

- Level: warning
- Rule sets: EN 16931 rules as ZATCA ships them (UBL) SDK 3.4.6
- Context: `/ubl:Invoice | /cn:CreditNote`
- Test: `exists(cbc:ID) and string-length(cbc:ID) > 127`

Validate a document against these rules: https://xmlvalid.com/validate