Max Date over virtual table

We want to help you but your description is too vague. 👎

Please write it again clearly.

Please DON'T copy & paste your DAX that does not work and expect us to fathom what you want to do. That is a bit crazy. 😀

Please just give a simple non technical functional description of what you want, then let us suggest the solution. Thank you.

Provide example input data as table text (not a screen print) so we can import the data to build a solution for you.

Rename columns to user friendly names.
Also provide the example desired output, with a clear step-by-step description of calculations the process flow.
Remember not to share private data ... we don't want you to get into trouble. 😧

Remove any unneeded columns which may cause confusion.
(Your devote far too much text to proudly explaining what you have got working and completely fogot to explain the problem. How should the max date of cancellations should be derived. Is there a a cancellations date you forgot to mention?  What is it called? If the Augyst 2024 had 3 cancellations dated 10Aug24 and  12Aug and 15Aug24 then should the max date for August 2024 be 15Aug24? I we supposed to guess? You should try include all this infomation in the description. 🙄

Take time and care to use the same table and field names in the input, output and description so we can understand your problem and help you. 👍
Try keep it simple and ask one question per ticket.
You will get a quick response if you put time, care and effort into writing clear problem descriptions.