`TProposal`
pl		billedBuyer
pl		buyer
pl		buyerContacts
pl		buyerPrivateData
pl		hasBuyerSignedOff
pl		hasSellerSignedOff
pl		inventorySource
pl		isRenegotiating
pl		isSetupComplete
pl		kind
pl		labels
pl		lastUpdaterOrCommentorRole
pl		name
pl		negotiationId
pl		originatorRole
pl		privateAuctionId
pl		proposalId
pl		proposalState
pl		revisionNumber
pl		revisionTimeMs
pl		seller
pl		sellerContacts

`TGoogleBaseObject`