'Could not read text' pop-up in IT0128 (Notifications)

Hi,

We have customized the Notifications subtype to Z1, Z2, Z3 and Z4. The configuration works every time the Create button is used. However, once the record already exists and the Change button is ticked a pop-up occurs indicating 'Could not read text'.

I have already tried configuring the text in SO10 to be consistent with that in Infotype 0128 but it does not work. We would like to keep the subtype values as is (Z1-Z4).

If anyone needs further information, let me know. Appreciate any thoughts. Thanks!

Vance