Please leave empty fields in the pictures also empty in the entry mask. Do not fill in zero!
Also leave the field empty whenever a value is totally or partly unreadable or if the field in the picture contains a dash ("-").
In case you are just not totally sure but can decipher the number, enter the assumed value.
When you fill in the entry mask the background color may change:
Saving changes failed
Changes saved (may switch back to grey)