Hi Experts,
We are trying to update header and item fields of an outbound delivery at the same time using Postman.
First of all, we use the GET method to retrieve the token and etag.

On the second place, we use the POST Method to update fields at header and item level.
https://myxxxxxx-api.s4hana.ondemand.com/sap/opu/odata/sap/API_OUTBOUND_DELIVERY_SRV;v=0002/$batch

Body:
--batch_mybatch
Content-Type: multipart/mixed; boundary=changeset_mychangeset1
--changeset_mychangeset1
Content-Type: application/http
Content-Transfer-Encoding: binary
PATCH A_OutbDeliveryHeader(DeliveryDocument='{{80001139}}') HTTP/1.1
Content-Type: application/json
Accept: application/json
If-Match: {{etag}}
{
"YY1_SD_RE_DLH": true
}
--changeset_mychangeset1
Content-Type: application/http
Content-Transfer-Encoding: binary
PATCH A_OutbDeliveryItem(DeliveryDocument='{{80001139}}',DeliveryDocumentItem='10') HTTP/1.1
Content-Type: application/json
Accept: application/json
If-Match: {{etag}}
{
"YY1_SD_SB_DLI": "TEST"
}
--changeset_mychangeset1--
--batch_mybatch--
We are getting the following error:

Do you have information regarding this error?
Thank you very much in advance for your comments,
Best regards,
Jorge.