Add a contact to party in REST

Content

Hi,

I am currently facing below issue when importing subscription with party contact:
The combination of party role and party must be unique.(OSS - 6075049)

Here is an extract of the payload.. It seems "PrimaryPartyName" at header level may be in conflict with "parties" object.. Or may be something else ?

{
   "SubscriptionNumber": "<my number>",
   "BusinessUnitName": "XX",
   "SubscriptionProfileName": "DEFAULT",
   "PrimaryPartyName": "<BILL_TO CUSTOMER name",
 ....
   "BillToAccountNumber": "127842",
   "BillToSiteUseId": 100000160776746,
....
   "parties": [
      {
        "PartyId": 100000160733793,
        "PartyRole": "ORA_CUSTOMER",
        "contacts": [
            {
               "ContactRole": "ORA_CUSTOMER_CONTACT",
               "ContactId": 100000161091092
            }
         ]
      }
   ],

Note: all Ids are correct

Thanks