Unable to call Update API using http request

[HenrikeGroetecke]

I'm trying to call the FixedAsset API to update an asset from S/4 Public Cloud using RAP.

However, I am getting an error from the API - "State of entity CDS~A_FIXEDASSET with key XXXXX was already changed (stale If-Match)"

in before, I am getting an error about missing etag. Now, I'm taking the system date and time to be used as etag. I search that doing a batch request can do this but have no idea how to code it and I am using http client request and not service consumption model.

 DATA(lo_destination) = cl_http_destination_provider=>create_by_comm_arrangement(
comm_scenario = 'XXX'
service_id = 'XX'
comm_system_id = 'XXX'
).
DATA(lo_http_client) = cl_web_http_client_manager=>create_by_http_destination( lo_destination ). 

DATA(lo_request) = lo_http_client->get_http_request( ).

DATA(lv_uri) = |/sap/opu/odata4/sap/api_fixedasset/srvd_a2x/sap/fixedasset/0001/FixedAsset/&1/&2/&3/SAP__self.Change|.

DATA(lv_date) = cl_abap_context_info=>get_system_date( ).
DATA(lv_time) = cl_abap_context_info=>get_system_time( ).
DATA(lv_etag) = | { lv_date+0(4) }-{ lv_date+4(2) }-{ lv_date+6(2) }T{ lv_time+0(2) }:{ lv_time+2(2) }:{ lv_time+4(2) }Z|.

lo_request->set_header_field(
EXPORTING
i_name = 'if-match'
i_value = |W/"datetimeoffset'{ lv_etag }'"|
).

lo_request->set_uri_path( lv_uri ).

DATA(lo_res) = lo_http_client->execute( if_web_http_client=>post ).
DATA(lv_text) = lo_res->get_text( ).

can you provide a solution so I can update asset using API?

[HenrikeGroetecke]

Hello, thank you for your question. It has been forwarded to the experts. Kind regards, Henrike

[DiegoValdivia]

I think I know the answer. Put your code inside the Code Block for better readability and I'll help you

[HenrikeGroetecke · Accepted solution]

Hello,

Thank you very much for your question.

Can you please check whether the following information solves your issue?

To update an asset using the FixedAsset API in SAP S/4HANA Cloud, you need to handle ETags correctly for concurrency control. How to use etag for change operations in S/4HANA OData APIs The error message ‘State of entity CDS~A_FIXEDASSET with key XXXXX was already changed (stale If-Match)’ indicates that the ETag you are using is outdated.

Steps to Resolve:

1. Fetch the Current ETag:

   • Before making an update, perform a GET request to retrieve the current ETag of the asset. This ensures you have the latest version.

2. Use the ETag in Your Update Request:

   • Include the ETag in the ‘If-Match’ header of your update request. This tells the server that you are working with the latest version.

3. Batch Request for Updates:

   • You can use a batch request to handle multiple operations APIs for Sales - ETag Handling in one call. This involves creating a changeset with the ETag and the update payload.

Example Code for Batch Request:

DATA(lo_destination) = cl_http_destination_provider=>create_by_comm_arrangement(
    comm_scenario = 'XXX'
    service_id = 'XX'
    comm_system_id = 'XXX'
).
DATA(lo_http_client) = cl_web_http_client_manager=>create_by_http_destination(lo_destination).

DATA(lo_request) = lo_http_client->get_http_request().

" Fetch the current ETag
DATA(lv_uri_get) = '/sap/opu/odata4/sap/api_fixedasset/srvd_a2x/sap/fixedasset/0001/FixedAsset/&1/&2/&3'.
lo_request->set_uri_path(lv_uri_get).
DATA(lo_res_get) = lo_http_client->execute(if_web_http_client=>get).
DATA(lv_etag) = lo_res_get->get_header_field('etag').

" Prepare the batch request
DATA(lv_uri_post) = '/sap/opu/odata4/sap/api_fixedasset/srvd_a2x/sap/fixedasset/0001/FixedAsset/&1/&2/&3/SAP__self.Change'.
lo_request->set_uri_path(lv_uri_post).
lo_request->set_header_field(
    EXPORTING
    i_name = 'If-Match'
    i_value = lv_etag
).

" Execute the update
DATA(lo_res_post) = lo_http_client->execute(if_web_http_client=>post).
DATA(lv_text) = lo_res_post->get_text().

Kind regards,

Henrike

[1] How to use etag for change operations in S/4HANA OData APIs

[AlexLukashevich]

Hello @JastinC1 ,

There is an example how to get the correct value for Etag from the request in Postman.

Use the next url path /sap/opu/odata4/sap/api_fixedasset/srvd_a2x/sap/fixedasset/0001/FixedAsset/X/X/X to get value of "@odata.etag ":

Then paste it to the header If-Match

Best Regards,

Aliaksandra