The service period of an individual line when it differs from the document-level period (BG-14) — e.g. when several months are billed on one invoice.
cac:InvoiceLine/cac:InvoicePeriodram:SpecifiedLineTradeSettlement/ram:BillingSpecifiedPeriod Part of BG-25 Invoice line
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Semantics: EN 16931-1. Simplified explanation in our own words — the norm is authoritative.