Distribution of SSI details using FIX 4.4

Imported from previous forum

Just-in-time SSI Enrichment.

The maintenance of SSI remains the responsibility of then Custodians whilst allowing the Fund Managers to enrich application messages with up-to-date SSIs.

Custodians send a periodic update of basic SSI details to be capruted in a buy-side SSI database.

All this sounds great, I am looking at how the 4.4 Settlement Instruction can be used as the vehicle for passing updated from the Custodian to the FM based on:

I take the recommendation of the most basic data needed for full enrichment (I make the assumption I am only trading one product per market for simplicity),

PSET
Agent BIC
CSD Identifier
Securities Account Number
Cash Account Number
Investor Id
Registration Number

Can anyone point me towards an example of a Settlement Instruction (in either tagged or FIXml format) message updating any or all of these fields? Or a specification on usuage?

I can’t decide which component block (Parties or SettlParties) to use, nor where I identify the market the SSIs apply to.

Help is appreciated,

Chad.