Feed Documents/Drawing? or Technical Specifications?

Hi There;

Assume that you are undertaking an EPC Project. And you have been given feed documents/drawings and technical specifications for HVAC for example by th client.

Can you claim for the equipments or any other materials which have not been mentioned or listed in the feed documents/drawings?

While the technical specifications describe the client requirements.

I mean is that true or false to use just feed documents/drawings for claiming? Not taking into account of the clients technical specifications.

Regards