All, our company uses Azure Managed Database Instance and they work fine, except when I try to right-click a procedure and select modify, it produces an error message: Invalid version: 16. (Microsoft.SqlServer.Smo).
This happens to any stored procedure I try to modify. It also happens if I right-click a procedure and try to script it ... But, if I connect to this db server from an on-premise sql server instance, I can modify or script the procedure without any problem. This appears to be an issue with Azure Managed Instance.
I checked the permissions on the user, tried connecting from on-premise sql server, searched for online help. I haven't found any answers to this question.
As @Thom A notes, you probably just need to update SSMS, but alternatively, here's how to modify a stored procedure without SMO/SSMS scripting it for you.
You can use OBJECT_DEFINITION to get the stored procedure DDL, and then print it to the console. Then copy and modify it (change CEREATE to CREATE OR ALTER). eg
The PRINT command truncates long strings, so this trick of using xml allows long strings to be sent to the client without character escaping.