Hi there,
Masa is correct when saying you should be using a BADI, because you are just adding fields to the odata structures no harm should come to your current Fiori application as it should still only read the fields it needs, by adding fields to the service all you are doing is making the odata service more robust.
as for actually updating the odata service.. do to the following;
- Extend the fields of the structure you want to add to the new application.
- Create the BADI (enhancement spot GBAPP_APV_PO in transaction SE18), here you can populate and handle data based on your requirements, instructions can be found at here .
- before you can see your service working make sure you clean the cache on both the GW and ERP system. just use transactions /IWFND/CACHE_CLEANUP on GW and /IWBEP/CACHE_CLEANUP on ERP, if you don't do this, don't expect to see your fields in the odata
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GL and if you want any more help, feel free to send me a msg.
Cheers
Shaun