navigation between contract and contract based invoice
currently there is no direct link from a contract based invoice and contract - if you want to have it you need to add manually link to supplier contract in link function. In old Medius (HF10) you had direct link from contract number field to contract so you directly go to the contract (and back) when you wanted to check something. Such automatic link should be added automatically by the system once a contract based invoice is connected with a contract without further user interaction that improves navigation usability.
As soon as the invoice has been connected to a contract the link is created.
You find in in the"invoice details" tab under the heading Connected contact