Is there any way to enter an attention/warning  message on the Service Offer screen or in the order form? Something like a pop-up or an alert similar to what appears on the CA's main support page (bot on the left).

Maybe a highlighted window with a yellow or red color and a blinking text using html marquee or jquery

Examples where a warning would be interesting:
1 - "The vCenter development environment it is in process of migration and there may be more than normal delay in creating a VM in this environment";
2 - "The supply of server provisioning in z / VM is temporarily Unavailable";
3 - "From the day 01.01.2099 the offer of creation of application servers will not have more backup service";

Hi,

this appears to be a job for the News Message option, which will then appear on the front page of the request catalog:

Manage News, Change Events, and Alerts

Manage News, Change Events, and Alerts - CA Service Management - 17.0 - CA Technologies Documentation 

regards

Iain

It is not functional ... Besides being practically imperceptible (rich text does not seem to work) I can not categorize a message by offer, only by functions (in the Catalog).
I need a more powerful warning and, if possible, that it is for a particular offer and not for the entire Catalog.

Unfortunately that's all that's currently available in the product. If you need more granularity, you'd need to raise an Idea, sorry.

However, if you want to make the notifications bar more obvious, you could customize main.css and change the #notifications section to e.g. increase size, change colours and so on.

regards

Iain

Another option might be to invoke the alert onLoad of the form (via the onLoad attribute) or you can create a JavaScript function to conditionally display the alert based on user interaction/logic.