LastParPx

FIX Field 669

Tag	Name	Type	Enumerated	First introduced
669	LastParPx	Price		FIX.4.4

Last price expressed in percent-of-par. Conditionally required for Fixed Income trades when LastPx (31) is expressed in Yield, Spread, Discount or any other type.

Usage: Execution Report and Allocation Report repeating executions block (from sellside).

Notes

Please post comments, clarifications, examples here. Click on the edit button on the right and away you go! 

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.