Incorrect error for LSID field
If you enter a value into the name LSID field and then remove it again you get an red error "URI wird nicht gespeichert! null". This is not correct. A non existing LSID should not lead to an error message (but please guarantee that the LSID is fully removed from the name).
Could you also change the label from "Lsid" to "LSID"?