getting Failure While saving Error running 'OnSaved' in logic module 'VI.DB.Entities.EntityScriptLogic'.

Hello

Using OIM 9.1.2

since  a week, from time to time, we have this error :

When OIM receives  night updates from RH, this triggers changing 3 properties on the object Person in OIM, but saving them doesn t work anymore..

xxxxxx is centralAccount :

CCC_XXXXXX.OIM_Person.Save() For xxxxxx - Failure While saving Error running 'OnSaved' in logic module 'VI.DB.Entities.EntityScriptLogic'.
CCC_XXXXXX.OIM_Person.Save() For xxxxxx - Failure While saving at VI.DB.Entities.CombinedEntityLogic.<OnSavedAsync>d__15.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at VI.DB.Entities.InteractiveSaveEntityStrategy.<OnSavedAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at VI.DB.Entities.DbEntitySink.<PutAsync>d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at VI.DB.Entities.UnitOfWorkImpl.<_PutEntity>d__42.MoveNext()

I'm really stuck and i don't know how to debug it..it used to work before on all employees but now no

Any idea?

Kind regards,