"The customer overspecified the requirements and now we're contractually required to build it this way. Does he think he's an engineer?"
2.VerbTo specify excessive capability.
"As usual the customer overspecified the requirements, it's like asking for a car that seats 20 and fits in a compact car's parking space."
3.VerbTo provide redundant or inconsistent information.
"An overspecified truth table contains at least one decision that will never be executed because it is already specified in a previous decision...; A noun phrase is overspecified when it is used in a context where a pronoun would have been unambiguous."