add text on handling if VPs have different nonces

openid-4-verifiable-presentations-1_0.md

@@ -1082,7 +1082,7 @@ The Verifier MUST create a fresh, cryptographically random number with sufficien
 
 The Wallet MUST link every Verifiable Presentation returned to the Verifier in the VP Token to the `client_id` and the `nonce` values of the respective Authentication Request. 
 
-The Verifier MUST validate every individual Verifiable Presentation in an Authorization Response and ensure that it is linked to the values of the `client_id` and the `nonce` parameter it had used for the respective Authorization Request. If the response contains 
+The Verifier MUST validate every individual Verifiable Presentation in an Authorization Response and ensure that it is linked to the values of the `client_id` and the `nonce` parameter it had used for the respective Authorization Request. If the response contains multiple Verifiable Presentations which do not contain the same nonce value, the response is rejected.
 
 The `client_id` is used to detect the presentation of Verifiable Credentials to a party other than the one intended. This allows Verifiers take appropriate action in that case, such as not accepting the Verifiable Presentation. The `nonce` value binds the Presentation to a certain authentication transaction and allows the Verifier to detect injection of a Presentation in the flow, which is especially important in the flows where the Presentation is passed through the front-channel.