How to define a rule to default project task numbers on requisitions based on SLA mapping set ?

Summary:

Where can a customer find more information on functionality to define rules for defaulting project values like 'Project Task Number' on requisitions or purchase orders based on purchase categories used on transaction ?

Standard documentation (Doc ID 2250648.1) already provides a how-to guide to default 'Project Expenditure Type' and 'Project Expenditure Organization' - we would need the same for project task number (based on task service type)

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Content (required):

Project Number LOV should be defaulted based on Category name (purchase category) used on requistions.

Many to many mapping between Purchase Category and task service type. After filtering, if Task Number LOV contains only one record then that value should be defaulted.