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Explanation: it's obvious that one part has to deliver some drawings and maybe even calculations for an unknown part of a building - we call this elaboration or project engineering - for example: the elevator contractor MUST elaborate his own drawings and if there is a dog in it it's his problem (architects are never guilty;-)))) )
D D Local time: 02:29 Native speaker of: German, English PRO pts in pair: 321
Explanation: This is suggested by LEO. In this context it does fit because the sentence is excluding liability for deficiencies in the technical preparatory work as well as in that part of the building that it deals with.