Deleted invoice in Data File Display & Maintenance

I have a very old MAS 90 version 3.4, my boss never had the money to upgrade and I made a huge mistake. I went into Library Master-Data File Display and Maintenance-ar4001, then looked up an invoice I needed to delete from my A/R that was over 10 years old. I did that but now I cannot run period end and I don't know how to retrieve that old invoice I deleted. HELP! I am totally freaking out!

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