Documentation to how integrate SAP R3 at the application level

Hi,
I’m looking for information on how to integrate SAP R3 at the application level, or another legacy system, into One Identity Safeguard SPP and SPS. I looked within the One Identity documentation however, I haven’t found anything related, only references to SAP S/4HANA as an asset.
Do you know where I might find information/documentation/guide to carry out a similar implementation? Since this is an application-level implementation, simply adding it as an asset won’t meet our requirements.
Best regards,