Checks that one serialized supply chain object (SCO) is well formed, without verifying the entities it declares. Send the serialized SCO string as sco. The response reports a status of valid, invalid, or error and, where the SCO cannot be accepted, the reasons codes for it: the SCO declaring an incomplete chain (101) or the string failing to deserialize (102). No seller records are consulted, so authorization problems are not reported here — use the validate-and-verify endpoints for those.