Shares and locks between SEU, EDTF and VSCode

When I open for update a source member with SEU (option 2),
then try to open it with VSCode, it sticks waiting the member is free of lock for update.

this is correct. but a message explaining the long-wait issue would help user to understand what happens.

the issue is that the opposite is false:
When I open with vscode a source member
then try to open it with SEU, it does not wait.

I have try CHKOUT on the member, it is not supported
Message ID . . . . . . : CPFA0AD
Message . . . . : Function not supported by file system.

For now, I am stand alone in my own dev library, so the issue is low priority.
Do you have a recommendation for teams working everybody in the same library ?

for stream files the issue is different
1) open a stream file with EDTF
2) reopen it with VSCode- no issue
3) change it under EDTF, save, exit
3) the code is immediately updated in VSCODE as soon as VSCODE get the mouse focus.
4) change it differently under VSCODE
5) reopen with EDTF
6) change it differently, save, exit
7) VSCODE does neither refresh nor advise of a simultaneous update