Validation message
[BR-CO-19]-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.
Context
cac:InvoicePeriod
//ram:ApplicableHeaderTradeSettlement/ram:BillingSpecifiedPeriod
UBL
XPath
CII
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