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The value of the variable which you are using for the insertion is null.
ok i will have some entries in the table
No,In the process model where you are trying to use writetodatastoreentity smart service. open the instance for which you are getting this issue and in that open process variable and see the value of the variable which you are using while configuring the smart service. it should not be blank/null.
the maintenance id column is having an integer value but still its not working
Could you please show me the process variable value for that instane?