We are working on a project whereby the Engineer's tender document had an error in the specification where they listed a part number and a description of the part, however, the 2 were marginally different and we priced according to the part number, which turned out to be the incorrect part. The order of precedence has specifications above drawings; I've confirmed that drawings did not give any indication into the part. The engineer is saying that we ought to have reasonably known there was a conflict in the part number vs the description and the owner does not want to bear the cost for this correction. We have not yet ordered the products nor have we submitted any shop drawings or product sheets. Since the order of precedence isn't going to help here, what has been your experience when there is a conflict between a part number and the description of a part? I can confirm that the contract does not have a precedent of part number vs a description.