How to identify argument number in Create Receivables Accounting program

Summary:

In Create Receivables Accounting program I need to identify which argument number is for Business Unit. This is required because I need to provide the list of arguments to an external scheduler that will invoke this job.

In Manage Enterprise Scheduler Job definitions I can see the list of parameters and Business Unit is one of them but I am not able to identify which argument number is for Business unit.

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