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Подскажите пожалуйста зачем нужны правила RU9C и RU5C?

Используеся в функции RUPAY:

Дока:
RUPAY Determining Payments

Object

Function

Use

This function determines the payment amount per payment grouping for all
personnel assignments, and considers all advance payments that you have
already made for the current payroll period.

The function calls a personnel calculation rule to round the payment
amount or re-calculate the amount according to the percentage of the
advance payment.
The function then transfers the payment-relevant wage types to the
Payment Information for Person (BT_PERSON) table according to the
entries in the External Transfers (0011) and Bank Details (0009)
infotypes.

The Net Amount, Retroactive Accounting, and Payments (RUCR) schema calls
the function with parameter 3 = 0296 to process all garnishment
documents stored in the Garnishment Documents (0296) infotype and the
corresponding payments. The function calls a personnel calculation rule
to process such payments and transfer them to table BT_PERSON with the
Set Recipient Data for Bank Transfers (BTREC) operation.