[AR] How to change a specific segment value with SLA

I would like to achieve the following in the AR SLA settings, but could you please tell me how to set it up?

・An environment where the AFF segment structure is defined as 7 segments
・When the transaction type of the AR transaction is TEST_accounts receivable
Set the customer code that links segment 6 of the distribution AFF (for both accounts receivable/accounts receivable and revenue lines) to the transaction
The image of the AFF value before and after setting the SLA is as follows.

(Before SLA setting) 11000-ZZZ-S100000003-ZZZ-ZZZ-ZZZZZZ-ZZZ
(After SLA setting) 11000-ZZZ-S100000003-ZZZ-ZZZ-012345-ZZZ