When trying to add a valuemapp from Frontend, it shows the Error:
Error in query [INSERT INTO valuemaps (name,valuemapid) VALUES ('test','25')] [Duplicate entry '25' for key 'PRIMARY']
SQL statement execution has failed "INSERT INTO valuemaps (name,valuemapid) VALUES ('test','25')".

Seems like Zabbix doesn't check the latest number on the Table, f.e. with select MAX(valuemapid) FROM valuemaps;