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But thats just a guess.
If you didn't actually attempt to purchase something then make a support ticket and ask them what its about. If they won't help then watch your credit card bills for the next few days and dispute it with your card company if/when it shows up.
Do you have any games with recurring charges?
I do hope you figure out what that 'transaction' is so you can prevent it from happening again, or at least not surprising you anymore.
However, if it is a posted charge, you need to work that out with Steam Support as disputing the charge will get that card banned from Steam. Heck, they used to ban the account from all future purchases, but apparently backed down and now just ban the card in question.
If not does anybody else have access to your account details, either directly on your PC or have you logged into any third party sites, e.g. skin trading or vote for my team type sites? If you have somebody could have stolen your details (phishing) and be using your account remotely.
If none of the above it's possible you either bought something and forgot or somebody has obtained your credit card details somewhere and just happens to be buying something on Steam.
By the way this thread will be locked by support as a necro, you really should've started your own discussion.