Adding a documention to a calendar throws a "value too large for column" exception

REQUEST: ./calendar/documentation/assign
PARAMS: {"jobschedulerId":"scheduler_joc_cockpit","calendar":"/Arbeitstage","documentation":"/custom/1.pdf","auditLog":{}}
USER: root
2019-01-18 15:04:37,199 ERROR 2051450519-11154 c.s.j.c.JOCDefaultResponse                   - com.sos.hibernate.exceptions.SOSHibernateObjectOperationException: could not execute statement: 12899 ORA-12899: value too large for column "SCHEDULER"."DOCUMENTATION_USAGES"."OBJECT_TYPE" (actual: 19, maximum: 10)
 [n/a] [DBItemDocumentationUsage[id=<null>,schedulerId=scheduler_joc_cockpit,documentationId=302,objectType=WORKINGDAYSCALENDAR,path=/Arbeitstage Amt,created=Fri Jan 18 14:04:37 UTC 2019,modified=Fri Jan 18 14:04:37 UTC 2019,dateTimeZone4Getters=Europe/Berlin]]
com.sos.hibernate.exceptions.SOSHibernateObjectOperationException: could not execute statement: 12899 ORA-12899: value too large for column "SCHEDULER"."DOCUMENTATION_USAGES"."OBJECT_TYPE" (actual: 19, maximum: 10)
 [n/a] [DBItemDocumentationUsage[id=<null>,schedulerId=scheduler_joc_cockpit,documentationId=302,objectType=WORKINGDAYSCALENDAR,path=/Arbeitstage,created=Fri Jan 18 14:04:37 UTC 2019,modified=Fri Jan 18 14:04:37 UTC 2019,dateTimeZone4Getters=Europe/Berlin]]
	at com.sos.hibernate.classes.SOSHibernateSession.save(SOSHibernateSession.java:965)
	at com.sos.joc.classes.documentation.Documentation.assignDocu(Documentation.java:56)
	at com.sos.joc.calendar.impl.CalendarResourceDocumentationImpl.assignDocu(CalendarResourceDocumentationImpl.java:85)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)