Unable to edit or remove the dividend data for self-defined assets

I have defined an asset for a fund LU1127387386 (AB - All Market Income Portfolio AD USD) and I manually input dividend data to the portal, but it does not allow me to remove or edit entries after saving. It will simply hang after clicking remove, and the pop-up window does not respond at all.

Sorry, I fixed that issue by not showing popup.

Please try again. Thanks!