TOP_Of_PAGE event in REUSE_ALV_HIERSEQ_LIST_DISPLAY firing only on I Page

Hi Team,

I have a background program which calls the FM REUSE_ALV_HIERSEQ_LIST_DISPLAY.

The program also calls TOP_OF_PAGE event which displays details like Page Number , User etc.

When the program is run in background, the TOP_OF_PAGE event is called only in the first Page and in the rest of the pages ,the TOP_OF_PAGE event is not called at all.

Can someone please help? thanks.