If SAP is set-up using a multi-instance gateway, APM External data provider connection to SAP fails with "Authenication Information is invalid". This is because APM to SAP Interoperability external data provider appends parameters in the link that aren't recognized by the SAP Gateway.
This issue has been corrected in APM hotfix 7.10.0.206 and later releases of APM.
VSTS #25868.