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FX-SCH-A-000213

If Invoice line period (BG-26) is used, the Invoice line period start date (BT-134) or the Invoice line period end date (BT-135) shall be filled, or both.

error: the document is invalid

What the rule checks

As the rule set's publisher wrote it. The rule runs on every element the context matches, and fails where the test is false; the validator reports the line of that element.

Factur-X BASIC rules 1.09
Message

[BR-CO-20] If Invoice line period (BG-26) is used, the Invoice line period start date (BT-134) or the Invoice line period end date (BT-135) shall be filled, or both.

Context
//ram:SpecifiedLineTradeSettlement/ram:BillingSpecifiedPeriod
Test
(ram:StartDateTime) or (ram:EndDateTime)

Checked with Factur-X / ZUGFeRD BASIC