This is what we can monitor on SAP R3 and HANA.
The check plugins also point to the agent plugins necessary.
There is also an KB article and this is probably the post you referred to, but did not dare to link? 
Other than that, there may be users here, that can help, but at Checkmk we have no in-depth SAP knowledge. I know it is possible to do in your environment what you want to do, I just cannot provide more help than this.