No.. I don't think so... If he is commission by you to provide a PCB and it fails to work... Then he is obliged to make good the circuit, not you!!!
Well, the current orders that were placed were a PCB design and 5 prototypes based on that design. My guess is that the PCB design is done on a "best effort" basis, using all best practices and done in the most professional way.
However I can imagine that at this stage it is impossible to say 100% that the design will work once produced. It's not the same as piece of software you've written and have unit tested 100%.
I guess some errors might only show up once you create an initial prototype.
Now, as far as these prototypes go, I can also imagine that it is difficult to claim or guarantee that these prototypes will work.
Perhaps during manufacturing we'll see some flaws in the design. The prototypes also include a GPRS module + internal antenna, and as far as I know this alone is all very specific and error prone stuff.
So I can relate to some degree that the initial prototypes might still contain errors and will need some patching. (breaking a routes, or re-routing something with a wire, applying an external antenna if the matching of the internal antenna was off, .......)
I think I understand now that for a designer it is very difficult to guarantee with a 100% certainty that the first protoypes based on the design will work.
You also mention this in another post. Usually you get it right the first time, but sometimes you might need a small re-design and new prototypes. Obviously if the second batch fails you would need a sit-down to avoid this becoming a never-ending story. But at some point you simply need to trust the good intentions and professionalism of the designer.
Earlier you mentioned that you have the rights to the schematic... Is this the case?
What is the difference between the schematic and the design ? For me those are the same. Guess I still need to do my homework on that one.