# FX-SCH-A-000060

Source: https://xmlvalid.com/rules/FX-SCH-A-000060

> If Invoicing period (BG-14) is used, the Invoicing period start date (BT-73) or the Invoicing period end date (BT-74) shall be filled, or both.

- Level: error
- Rule sets: Factur-X BASIC rules 1.09
- Context: `//ram:ApplicableHeaderTradeSettlement/ram:BillingSpecifiedPeriod`
- Test: `(ram:StartDateTime) or (ram:EndDateTime)`

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