Mistakes like the one mentioned are exactly why ALL of my proposals have a statement that says "Errors and omissions in design by others are not (company name) responsibility. All changes to,or additions reqquired by others ( i.e. inspectors) or to meet code are not included in this proposal."
If the architect or engineer put out a poor drawing, let them pay for the mistakes. After all that is one reason they carry errors and omission insurance.
