Nested4PartyRole/5 InvestorID

Nested4PartyRole Value 5

Value	Name	Field(tag)	First introduced
5	InvestorID	Nested4PartyRole(1417)	FIX.4.3

For Equities:

Identifies beneficiary or broker acting on behalf of beneficiary. This field is mandatory for various exchanges either pre or post trade.

Numerical entry containing no dashes.

For CIV:

An Investor identifier such as a taxpayer reference (NINO, NPN, DSS, SSN number etc) for an individual investor or a registration number (EIN, etc.) for a company.

May contain alphanumeric and dashes.

Notes

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Don't forget to refer to the FPL Discussion Groups to back up anything you write.
You will often find the authoritative statements on matters of FIX specification interpretation there.
Links from FIXwiki pages to relevant discussions on the FPL site are very valuable.

For example if you were writing a clarification on how to specify the "quantity" of an order in FIX, you might add the
following relevant link, http://www.fixprotocol.org/discuss/read/f5014573, to back up your points.