The reasons for the target error.
|Cannot add new proposal line items to a Proposal when
|Cannot archive proposal line items from a Proposal when
|Cannot archive a Proposal when Proposal.isSold is
|Cannot change a field that requires buyer approval during the current operation.
|Cannot find seller ID for the Proposal.
|Proposal must be marked as editable by EditProposalsForNegotiation before performing requested action.
|Proposal contains no proposal line items.
|No environment set for Proposal.
|The Ad Exchange property is not associated with the current network.
|Cannot find Proposal in Marketplace.
Product exists for buyer-initiated programmatic proposals.
|A new version of the Proposal was sent from buyer, cannot execute the requested action before performing DiscardLocalVersionEdits.
|A new version of the Proposal exists in Marketplace, cannot execute the requested action before the proposal is synced to newest revision.
|No Proposal changes were found.
|The value returned if the actual value is not exposed by the requested API version.