I'm facing a big problem for two weeks now

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I'm facing a big problem for two weeks now. I marked my student Dropped with Failure but his grade is 2. 5. I made a mistake. I ticked the box of my student and clicked posted in the University Prisms and once clicked posted it can't be retrieved. Two weeks ago I was sick and there were pressures for due dates of grade posting. The one supposed to be marked D/F was the student next to the one I Dropped. I applied for grade correction in the university registrar and was processed and submitted two weeks ago but yesterday my co teacher texted me my request was returned for it needs an attached letter. This day I felt mentally exhausted writing for an apology letter and appeal to reconsider my request to avoid conflicts. Please help me pray. May the university replaced the D/F grade to 2. 5. I expressed on my letter my sincere apology Thank you guys for reading.