If you mark this field, the job parameter marked as default will overwrite any other valid job parameter of the given type, when job parameters are rederived to a certain job. The functionality of this field is only relevant when rederivation of parameters gives rise to using another job parameter selection rule than the one previously used for deriving parameters to a given job, that is, if the job parameter selection rule from which job parameters are rederived to a given job is the same as the rule previously used on that job, the field “Overwrite” will not have any effect.
An example of the functionality of this field can be illustrated as follows:
You have created the following two job parameter selection rules:
You create a job. At the creation of the job, job parameters are derived to the job from rule no. 101. As the parameter A is specified as default value for the parameter type T1 on rule no. 101, the parameter A is assigned to the new job.
You then make a change to the job resulting in a rederivation of job parameters to the job. The change made on the job means that parameters are now rederived from job parameter selection rule no. 102. As rule no. 102 includes the parameter type T1 having the parameters A and C; C marked as default value and overwrite, the parameter C will be the new valid parameter of the type T1 derived and assigned to the job in question.
If the parameter C in rule no. 102 had been marked as default value, but had not been marked in the field “Overwrite,” the parameter C would not be assigned the job as default value, as the parameter A already assigned to the job is also valid on rule no. 102. The fact that the parameter A of the parameter type T1 on the rule no. 101 is also valid on rule no. 102 thus means that at rederivation from rule no. 102, the parameter A is the parameter derived and assigned to the job, even though parameter A is not marked as default value on rule 102. The functionality of this field can also be illustrated as follows:
The field can only be marked for job parameters marked as default parameters.
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