After reversing ISU Invoice, Reversal entry not shown in FPL9

I created an invoice, which is shown in FPL9 as IS-U Invoicing. But when I reversed the invoice using EA15, the reversal entry is not posted in FPL9, but the original invoicing document which was posted in FPL9 got disappeared.

I checked the entry in DFKKOP. The entry was like below.

Original Invoice document No: 100000 with Main 100, Sub 0002 with clearing document 200000 (Invoice reversal Doc.).

In DFKKOPK, both 100000 and 200000 exists.

Then why neither of the documents are shown in FPL9 after reversal?

Thanks,

Viraj