AHCS Aggregation - Understanding how it occurs

Summary:

Looking to understand how AHCS aggregates data when sent to the GL. Let's say there are three journal lines within the subledgers, AHCS will come in and check on if the COA segments, Balance Carrying Supporting References, and Line Descriptions are the same. If they are, then all three of these lines will go in as one line in the GL. I want to know if this is a configurable setting? Can we, as customers, determine which items determine whether the lines get aggregated?

Content (please ensure you mask any confidential information):

I'd like to understand how aggregation works at the AHCS (Accounting Hub Cloud Service) level. We book manual journal entries via the APEX page (acts as a subledger). We have it setup this way so that we can book these entries with supporting references. When we upload a manual journal entry and review the XLA File Creation (from the File Import & Export page), we find that no aggregation occurs - meaning that all line entries show up in this XLA file. However, once the file gets picked up through "Import Accounting Transactions" (process within Scheduled Processes page) and we