Contracts and Quotes: Activity module subpanel not showing assigned user search

Hello.
I’m using SuiteCRM 7.3.1.
In most modules that have Activities subpanel, on going to the ‘Activities’ subpanel and clicking on ‘New Activity’, it shows a quick create form with the field ‘assigned_user’.
When I type some words, the form searches automatically for Users, but in the AOS_Contracts and AOS_Quotes modules this doesn’t happen…
I have two attachments, the ‘search_ok.png’ show what happens in the other modules. The ‘search_fail.png’ shows what happens with the AOS_Contracts and Quotes modules.
I already tried to repair everything, but the problem persists…

I checked the browser html output, and in the working modules there is the following html div (in Contracts and Quotes this code doesn’t appear):

What could I do?
Any help would be appreciated. Thanks.

Best Regards,
Ramon Marcondes