Leave advance payment issue with tax dedctions

Hi all:

I have a situation where we used PC00_M13_CADV to make a payment to an employee's annual leave in advance. Payment went through smooth but in the periods where the employee's is on leave - as per the process his payments are zero( because we have paid him in advance) - but it is creating /561 claim.

What I have observed in the log is, it has not been taxed at the time of advance payment. I tried with processing classes of that wage type - still could not fix it.

Can anyone please throw some idea?

Appreciate your help in this regard.

Bas