How to derive different accounting codes for service types

Summary:

We would like to derive a division segment based on service types, but we have one level task structure only and cant go further to create several child tasks to associate service types at child tasks, so we have to have single task but that task can have transactions for several services so we need to derive accounting especially while we derive accounting for revenue and cos accrual and cos accrual contra revenue events. Please advise.

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