POST Function Import in Gateway Builder

Question

Hi everyone,
I am trying to create a new Function Import in SEGW transaction (Netweaver Gateway Builder).
I have followed different blogs (For example: Let’s code CRUDQ and Function Import operations in OData service!) and managed to create one.
However I am having 2 small differences:
1.  I am trying to make a Http POST Function Import which is a bit different in the way you call the service.
2. I have a parameter with type Edm.Guid.
I have not found any documentation about these 2 specific things.
Here is what I have...
My function and it`s parameters in SEGW:
My metadata:
The URI I am trying with it`s payload:
/sap/opu/odata/sap/MY_SERVICE/AddTransferProducts
with
<?xml version="1.0" encoding="utf-8"?>
<atom:entry xmlns:atom="http://www.w3.org/2005/Atom" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
<atom:content type="application/xml">
<m:properties>
     <d:DocGUID>guid’12345678-aaaa-bbbb-cccc-ddddeeeeffff’</d:DocGUID>
     <d:Products>R100000</d:Products>
</m:properties>
</atom:content>
</atom:entry>
With this setup I get the following error when I call the service: 404 not found
Anyone understands why it is not working ? Anyone already got this issue ?
Thank you very much.
Natalie

Answer 1

Metadata is showing GET method and the cache was cleared.
Here is a snippet of my code
CLASS xxxxx_DPC_EXT, method
/IWBEP/IF_MGW_APPL_SRV_RUNTIME~EXECUTE_ACTION
    IF iv_action_name EQ 'AddTransferProducts'.
      IF it_parameter IS NOT INITIAL.
*       Read Function import parameters values
        READ TABLE it_parameter
          INTO ls_parameter
          WITH KEY name = 'DocGUID'.
        IF sy-subrc = 0.
          lv_docguid = ls_parameter-value.
        ENDIF.
        READ TABLE it_parameter
          INTO ls_parameter
          WITH KEY name = 'Products'.
        IF sy-subrc = 0.
          lv_concat_products = ls_parameter-value.
        ENDIF.
        SPLIT lv_concat_products AT '||' INTO TABLE lt_products.
*       Save products in the staging table and get product information
        LOOP AT lt_products
          ASSIGNING <lfs_products>.
          ls_transfer_details-matnr =   <lfs_products>-matnr.
         APPEND ls_transfer_details TO lt_transfer_details.
        ENDLOOP.
*       Build the Document Details entity set to return
        LOOP AT lt_transfer_details
          ASSIGNING <lfs_transfer_details>.
          MOVE-CORRESPONDING <lfs_transfer_details> TO ls_entity.
          APPEND ls_entity TO lt_entityset.
        ENDLOOP.
*       Call method copy_data_to_ref and export entity set data
        copy_data_to_ref( EXPORTING is_data = lt_entityset
                CHANGING cr_data = er_data ).
      ENDIF.
    ENDIF.