Material test certificate issued by stockists

Could you advise stated below in the piping spec.

Certificates issued by material stockists or agents are not acceptable.

and

" Certificates for final products (such as welded fittings) shall include certification of the base material and a copy of the welding procedure qualification applied. If the Manufacturer of a semi-finished product and the Supplier of the base material are not the same, the certificate shall consist of two documents covering both stages of the manufacturing process. "

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The MTC may be issured by supplier or processor who are sold product or delivery.
I think so.

Material stockists and agents are trading companies without fabrication function so MTC by them are unvalid.

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