Sub files in RPGLE

I have a question on ILE RPG. The qestion relates to subfile. In the
condition where SFLSIZ = SFLPAG + 1, the system takes care of the Page
Up and Page Down key. Is this particular for ILE ?.  And When I give a
Page Down key after the last page is displayed, It shows a blank page
and then the Page Up doesnt work properly. I am using Relative record no
to navigate through the subfile records. I can give the source file if
needed. Could someone give me a hint in this? A working RPGLE code would
be fine.I am working on 9401 and V3R7.

Regards

Easwar

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