Problem while reversing MIRO document in MR8M transaction

Hi All Experts,

While reversing MIRO document in MR8M transaction, system showing below error message.

while i have try cancel the MIRO document two days back it has shown below error message.

Balance not zero:  129.77  debits: 236,119.23  credits: 236,249.00

Message no: M8534

But while i am cancelling the same MIRO document it showing same error message with different values.

Balance not zero: 687.86-  debits: 236,936.86  credits: 236,249.00

Message no: M8534

I am unable identify the problem and on what basis it calculating.

Please help me to resolve this issue.

Regards,

jayaraju