"Receipt Register" not showing all Receipts in May 2010 when ran with Parameter GL Date From=01-MAY-

 Hi,
We are in release 12.1.1
When running the standard report "Receipt Register" for the month of May, the report is missing some receipts.
For example, I have a Receipt with Receipt_Date in May, GL_Date in May but Applied_Date in June, then the "Receipt Register":
--> will NOT show this receipt if ran with parameter GL Date From 01May to 31May
--> will show this receipt if ran with parameter Deposit Date From 01May to 31May
Is it a bug or someone can explain to me to report's logic?

Thanks!
Servane