Hi Bogdan,
Please find exact path to get all visibility processes and also Procurement visibility process.
SAP Event Management Visibility Process -> Click Visibility Process on Related Topics (top mid corner you can see on the page) -> Click this link Procurement Configuration Guide and Click this link Procurement Scenario Description and Business Process Document.
Note: You need SAP OSS id to access these SAP Event Management visibility process documents.
Regards
GGOPII