Not possible to extract maintenance items object list given a serial number delivery

[SAPSupport]

Dear SAP Support,

I am trying to load outbound delivery data into Microsoft fabric via odata API. However, getting the following error: "There is no operation allowed on an entityset." while the API documentation states it should be possible to extract the maintenance objects via the api.

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[SAPSupport · Accepted solution]

Please check the following SAP Help Portal page for detailed information:

SAP Help - Outbound Delivery A2X

With this service, it isn’t possible to:

Directly address entity types other than the following:

A_OutbDeliveryHeaderType
A_OutbDeliveryItemType
A_OutbDeliveryDocFlowType (A_OutbDeliveryDocFlowType: GET operation possible for entity and not allowed for entity set)
A_OutbDeliveryHeaderTextType (GET operation possible for entity and not allowed for entity set)
A_OutbDeliveryItemTextType (GET operation possible for entity and not allowed for entity set)

According to this, you have to read via navigation from delivery item entity.