Could you please let us know whether the customers are using SAP S/4 HANA On-Premise edition or the SAP S/4 HANA On-Premise edition hosted on AWS Cloud.
The SAP Adapter is certified/supported with SAP S/4 HANA On-Premise edition and we are in the process of certifying/supporting the SAP S/4 HANA On-Premise edition hosted on AWS Cloud.
The webMethods versions supported are from wM 9.0 SP1.
for IntegrationServer versions mentioned in this thread you should be able to use SAP Adapter 7.1.
Make sure you are using latest Fix for SAP Adapter and latest versions of JCo API libraries.
See webMethods Adapter Requirements Guide for further informations.
We are in the stages of finalizing procurement contract of SAP S/4 HANA On-Premise Edition on AWS Cloud instance from SAP and as soon as the instance is available we will be starting the certification exercise for the same.