Cancel/Reversal of Invoice

Hi All,

I posted an invoice with MIR7 transaction code and now I want to calcel / reverse the same. When i go to MR8M to reverse the same, it gives me an error message, "Invoice document 5100100023 2010 does not exist". I also tried by using different reversal reasons but that didn't help. However when I put the same document number in FB03 screen, I can see all the details. Than why it says that the document doesn't exist (during reversal) when I can display it in FB03?

Is there any other way to reverse the same or where I am doing wrong?

Thanks for your time,

Jai