Intercompany AP COGS account creation

We want to change the COGS account derived when Create Intercompany AP invoices is run

My understanding is that the program is using the Account generator 'OM: Generate Cost of Goods Sold Account' , so we could create a new version of the workflow to derive a different ccid

Am I correct that this means we cannot use SLA to create a different code combination, as the Create Intercompany AP invoices program is using the workflow, not the SLA?