Locked out of iMatch: iMatch/HomeSharing/Apple ID Questions

Question

I purchased an iTunes Match subscription in November (with my Apple ID).  We recently gave our son an iPod and set him up on a separate Apple ID.  He has a separate log-in on our computer and I used Home Sharing to transfer some songs over to his log-in.  We also transferred over some of his purchased via Home Sharing so that I could save them on our external HD.  Somehow I have lost the ability to use iTunes Match.  It kicked me off and I can't sign back it.  I get a message that the "computer is already associated with an Apple ID and I can't associate this computer for 82 days."  I did not try to set up iTunes match on my sons account.  I only use it for our Apple TV and my iPad.  I don't understand how this got messed up.  I am not happy waiting for 82 days for it to reset itself as I paid for this service.
Is there anyway I can reset it?
Is there a way to know what I did to cause this issue?
Am I not allowed to have another Apple ID (my son) on the same computer? (but a different log-in).
Am I not suppose to type in his Apple ID on my log-in in order to transfer his purchased on to our HD?
RESPONSE FROM APPLE:
Greetings from Apple iTunes Store Customer Support! My name is Sabrish and I will assist you today.
I understand you have not been able to use iTunes Match as you receive a message "The computer is already associated with an Apple ID and you can't associate this computer for 82 days". I certainly understand your concern.
Once a device or computer is associated with your Apple ID, you cannot associate that device or computer with another Apple ID for 90 days. I'm sorry, but you will need to wait until
you have reached that time period so you can associate a different Apple ID.
For more information, please refer the below article:
iTunes Store: Associating a device for computer to an Apple ID for Automatic Downloads
http://support.apple.com/kb/HT4627
I hope the above information is helpful. Thank you for your interest in the iTunes Store. Have a nice day!
MY RESPONSE SECONDARY TO UNANSWERED QUESTIONS (WITHOUT REPLY)
Thanks for the response.  I still don't quite understand what I did wrong.  I went to an Apple Store today to discuss this issue and all the techs there were perplexed that I couldn't have more than one Apple ID on my computer.  They said that I should be able to have have multiple log-ins on the computer with each log-in having their own iTunes/Apple Id Account. My wife and I have Apple TV, the computer, an iPad and 2 iPods on our log-in.  We have 3 boys and would like them to have their own iTunes account so they can make individual purchases. 
So… are you saying this is not possible without messing up my iMatch account?  I did not try to associate iMatch with their device (only my wife's and my devices).
What do I need to do in the future to keep this from happening again.  I am very upset that I purchased a year long agreement for iMatch and have already been locked out for 90 days for not doing anything that I shouldn't be able to do.  I don't want this to happen again, when the timer resets. 
Can you please provide me with a solution to having multiple family members who have Apple ID's when I only have one computer.  Do I need to delete their Apple ID account? (seems ridiculous), or did I put this in motion by doing something like hooking up Family Share to their iTunes.
I fully understand restricting one device to one Apple ID account… but not the computer.
Any help would be greatly appreciated.

Answer 1

I'm not sure you can.  This explains the "90-day switch rule": iTunes Store: Associating a device or computer to your Apple ID - Apple Support.  You can try contacting iTunes store support to see if they can do anything for you: https://www.apple.com/emea/support/itunes/contact.html.