Pact Foundation

Issue: In the provider end, pact tests is failing with below error:-

Request to provider failed with an exception: “/” is not allowed in an identifier in path expression “$.data[0].relationships.user/shippingAddress.data.id” at index 28 (<http://au.com|au.com>.dius.pact.core.model.InvalidPathExpression)

My Request (POST):
“relationships”: {
        “user/shippingAddress”: {
          “data”: {
            “id”: “12345”,
            “type”: “user/shipping-address”
          }
        }

We are using junit5spring version 4.3.7. Is this a known issue in the pact ? Is there any way to fix this issue? Thanks.