Hello Sturm,
You can use it.
For this You need to implement QUERY / Get_Entity_Set method under the Service Implementation in SEGW.
Right click in QUERY / Get_Entity_Set and select ' Map To Data Source ' option, import that RFC and perform mapping operation.
In URL,
You need to send SNR value as part of filter parameter as below and hence you will get table of data as GW response.
sample :
/E2E_CHECK_SRV/<EntitySetName>?$filter=Snr eq 'XXXX'
Before would help ->
Step-by-step guide to build an OData Service based on RFCs – Part 2
Regards,
Ashwin