For an integration scenario I had to develop ABAP code in SAP BTP ABAP Environment (Steampunk) that calls a function module in the customer namespace (say YTESTRFC) in an on premise system landsacpe (D-, Q, P-).
Since the types being used are only available in that backend system landscape I wanted to use transaction ACO_PROXY to generate an XML file that can be used to generate a service consumption model in Steampunk
Unfortunately there was no role available in the development backend system that contained the value ACO_PROXY for the authorization object S_TCODE.
So what can I do?
Since this problem might also occur for other developers I thought that I post the solution in the SAP community.
Instead of using the transaction code ACO_PROXY I started the underlying report CREATE_ACO_PROXY and was thus able to download the XML file I needed.
(As a developer I fortunately had the authorization to use transaction SE38 )