Client Roles in a Three System Landscape

I initially post this Question in other forum:
Hi all,
We have a three system landscape. In the Development client, we have the Customizing Client, the Sandbox Cliet and a Training client. I have some questions about this configuration:
Acording to System and Client Settings - System Administration Assistant (BC-RRR) - SAP Library, Training client must be in Quality Assurance System, and it must be created by client copy from client QTST (it gets the transports from Custimizing). In this Training System we must create users for all our key-users to training. We must not create any user for key-users in sandbox client (this client is for the DEV team). is that ok?
What are the downsides of having out TRAINING client in the Development System?
Now, a consultant is asking me to open some modifications in the TRAINING client: He needs to load Exchange rates (OB08) in that client, but he is getting "Client is not modifiable". They are asking me to create users for key-users in the sandbox client and the training client.
I need to know if they are using the system in the right way. I dont want the system to become a mess.
I been reading this notes: SAP Note 356483. I don´t know what this means: "Now the corresponding Customizing object is no longer subject to the transport connection and is excluded from the changeability check. The change is active in all clients of the system. You can also change the Customizing object in a locked client (independent of the client role). However, now it is also no longer possible to manually transport entries of the view or table."
Aditional notes:
SAP Note 78329, sap kb 356483
Thanks for your help!
One person answere me this:
Hi
You should create your question in the appropriate area :
Software Logistics
The drawback of having training client in dev system is that it could be negatively impacted by ongoing changes performed in that system (custom program that are changed, not working...)
Some specific customizing changes can be set as current setting and thus can be modified without needing to open customizing but only if the client is set as productive.
There is also a way do deactivate modification recording of objects (aka deactivating the transport connection) but, if you apply this change for this activity/object, you won't be able any more to record change into transport orders
Regards
356483 - Customizing: Current settings in the test system
77430 - Customizing: Current settings

Hi Andres
I do not really now the exact impact, it might prevent some business data from being mass processed or overwritten...
I did had to deactivate the transport connection on specific objects/activities for some customers.
It depends on the frequency of that activity. I don't like to open the client to modification as you can sometime forget to close it back, and sometime also it gave the opportunity to other consultants to make changes that would create inconsistency among envt in the whole landscape.
At least activating the recording of changes could help in tracking the source of modifications
RZ10 => rec/client=ALL
STMS => RECCLIENT=ALL
Regards

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