Why am I receiving this error You cannot login to view documents using a non-standalone test account. Please use an SAP Business Network standalone test account.

Please register as new account from the PO email. The newly created account will only have test account on SAP Business Network and it can be used for further testing for standard account.

As per SAP Business Network standard behavior, in Test environment while taking ownership of standard account Purchase Order (PO) with existing account credentials the supplier needs to have only test account, not both production and test account. You have registered as production and test account on SAP Business Network, hence when you are taking ownership of the PO, you are receiving mentioned error. The error is self-explanatory, and means you need to have only test account in order to take ownership of the test PO.

This error is specific for test envioronment.

SAP Business Network for Procurement & Supply Chain