If your customer is requiring conformance to the PED 97/23/EC, then the answer would be no, the MTR must state the EN10204 and the 3.1, or the previous 3.1.A. And the supplier must have a quality system certified by a competent body, established within the community, aka, an ISO 9000 cert or equal and have been registered by a notified body from Europe, such as a TUV. AKA/Trade Barrier, about like a CRN for Canada is.
This is from the PED annex 1, 4.3
Hope this helps,