When you test the connection of your application with the blue button "Test connection" You receive an error: "This version does not support methodes from version 1.0"
Please upgrade your Accountview, hereby the prerequisites: https://support.apicenter.io/hc/en-us/articles/4407217611281-Prerequisites
The error message 'Accounting system error: This version of AccountView does not support methods from version 1.0.
The message comes up due to a connection problem. This may be due to incorrect setup. In that case, sending the test message from the General tab in the so-called accountview.net environment is the first step to get a clearer message about the cause. Otherwise, Visma could be checked to see if a clearer message could also be seen when sending the test message from the .net environment.
The experience is that this message usually disappears by itself.
If this did not lead to a solution, please contact Visma Support via https://nl.visma.com/accountview/support/