We use the internal Community Builder PMS.

We have two plans:
1. A basic plan, where user can only RECEIVE PMS messages and ANSWER received messages.
2. A premium plan, where user can RECEIVE PMS messages, ANSWER received messages and write NEW messages.

I can handle the most things in conditional fields. That works.
BUT when I click on the PMS envelope icon in menu, I see my income messages and the button "new message" on top. How can I control this button? I like to deactivate this button for plan 1. an activate it for plan 2.

Thank you!

Ok, the URL "hack" works. The "Full access granted for" was enabled for "administrator", so your idea didn´t work for me on first try. I deactivated this and now the button is not working in the plan. Perfect.

It would be great to have this feature in future. Some dating websites works with this limitations in communication for free plans/paid plans.

Thank you for your quick support!

Your code
option=com_comprofiler&view=pluginclass&plugin=pms.mypmspro&action=messages&func=new

works fine for the Button in the envelope area.

What ist the code for the message-link in the profile canvas area? I like to have the same "error message".
Where did I have to look for those URL codes? The Chrome Inspector gives me other codes. Did I have to look at the php file?

I´ve two different links:

Button-Link in envelope area (works: sending new messages is not allowed)
pluginclass/pms.mypmspro/new?return

Text-Link in the profile, I like to send a message (didn´t work: I can send message)
pluginclass/pms.mypmspro/message/new/15155?return

I think the part "message" and/or "151155" interrupt the code
option=com_comprofiler&view=pluginclass&plugin=pms.mypmspro&action=messages&func=new

Yes, actually both PMS are visible. But only for me, not for the users. That will be change.