Invoice line period start date
    The date when the Invoice period for this Invoice line starts.
About
    - ID
- IBT-134
- Cardinality
- 0..1
- Section
- Shared
- Name
- Invoice line period start date
- Syntax binding
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- Rules
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            - IBR-085: [ibr-085]-Start date of line period (ibt-134) MUST be within invoice period (ibg-14).
- IBR-073: [ibr-073]-A date MUST be formatted YYYY-MM-DD in (ibt-002), (ibt-007), (ibt-009), (ibt-026), (ibt-072), (ibt-073), (ibt-074), (ibt-134), (ibt-135).