System Message 28506 -- Must First unnaply Prepay before voiding check

Hello,  I'm working with SL2011 FP1

I'm trying to void a check  and the screen  030.40.00  is sending  the  message 28506.

The check that we are trying to void doesn’t have any Prepayment. It is only related with a VO document.

I’m been looking for any relation in APDOC, APTRAN , AP_PPApplicBat, AP_PPApplicDet   and there isn’t any reference with a PP doctype.

Thanks

Carlos Torre