The date on which the pension provider sends the investment order or instruction; in the FPR monthly cycle that is T-4. In message 15 the instruction date sits on the corporate action itself (investment.corporateAction), not in a reporting period.
Source: glossary of the VB-PUO manual (8.1 and 8.2), explanation by WTP Data Lab
Attribution. Source: SIVI – VB-PUO Standard. Schemas, attribute descriptions and code lists are taken unchanged from the VB-PUO Standard (owned by the Pensioenfederatie, managed by SIVI) and shown with their release and version. Explanations, examples, error descriptions and translations are by WTP Data Lab and are not part of the standard. GitHub Stichting-SIVI/VBPUOdsk · Manual · sivi.org