There are often more than one price in trading, particularly fixed income. But only one of those prices is the negotiated price and that one price always goes in BidPx(132), OfferPx(133), Price(44) or LastPx(31) with its denomination specified in PriceType(423). The other prices, which are derived from the negotiated price, go in other tags with specific denomination, e.g. BidYield(632), OfferYield(634), Yield(236), Spread(218) or LastParPx(669).
So to answer your specific question: In Quote(S) if PriceType(423)=9 (Yield) then the quoted yield goes in BidPx(132) or OfferPx(133).