When importing the SAP Integration Suite, managed gateway for spend management and SAP Business Network Add-on in the SAP NetWeaver (ERP) through transaction SAINT, below error is displayed:

No queue calculation because of a missing maintenance certificate

Maintenance certificates are required to be able to install and maintain SAP software with the Add-On Installation Tool and Support Package Manager.
These maintenance certificates can be requested with SAP Solution Manager and are distributed to the systems automatically.

In case there is any issues with the certificate or further assistance is needed, create a SAP OSS under the component BC-UPG-ADDON.

Missing maintenance certificate in the ERP.

For more information, see the SAP Support Portal under http://service.sap.com/maintenancecertificate and SAP Note 1240265.

SAP Integration Suite Managed Gateway > Managed Gateway for Business Network
SAP Integration Suite Managed Gateway > Managed Gateway for Business Network SCC > Managed Gateway for Buyer Business Network SCC
SAP Integration Suite Managed Gateway > Managed Gateway for Sourcing Integration
SAP Integration Suite Managed Gateway > Managed Gateway Foundation & Tools > Managed Gateway for Managed Gateway Portal