Cash Journal Problem

Hi gurus,

When I post a cash journal (expenses) in last fiscal year i.e. 2006 it is getting posted. But when I click on that particular expenses item it is showing two accounting documents. 1 is for 2006 and another is for 2007which is already posted with different amount.. why it is happening like this. The reference key in the header document are same for both the documents. Some times it is posting 1 profit center document sometimes it is posting 2 profit center document. When we reverse cash such kind of document journal with reversal reason 05 what will be the impact. What is reversal reason 05?

Thanks in advance.

Regards,

Vikas.