Fixing production issues

I am new to anaplan

can someone help me how to fix production issue using hotfix in anaplan with an example

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I want to believe that you are after something similar to this article?

Hope that helps!

Edit: Bruno answered while i was answering.

Is it not possible to have the same link in 2 dataspaces
We have 2 dataspaces (Training and Current), the training one had a link to a list in a Model. When i tried to add a link to the same list in the Current dataspace, the link showed as ticked and i could not select it. Does this mean you cannot link to the same source in 2 different dataspaces? It shows a tick in the LINK…
why is the basic lookup not working?
Module 1 : UID * FCST - source Module 2: FCST - Mapping Module 3: UID * Time Range- Target formula used in module 3 module1.line item[lookup: module2.timeperiod]
App Hub
Would someone advise how to find the App hub. I am following the module directions but I do not see it on my end.