Investment support / liability entries

Dear experts,

I am getting difficulty to understand how spec.reserves (AO88) acct is triggered during ABIF postings.

At the time of ABIF, I can clearly see asset deduction via standard account determination defined in AO90 (reduction APC value against investment support clearing account).

APC account Credit

Inv clearing account Debit

At the time of depreciation calculation, I can see following entries which make sense to me:

Val.adj.acct - inv.supp. write-off Debit

Ordinary write-back Credit

However, I should see somehow posting to Spec.reserves acct (inv.supp. on liab.).Where this liability account will recognize ABIF amount and how ?

Thank you all for your support.