AC: Amending a Single Journal Line Description Filed on a Large Posted Journal Fails with Governor Limit Exception (Heap via UI, CPU via API)
When a user attempts to amend a single journal line's 'Line Description' on a large posted journal, it results in a governor limit exception. This issue occurs in the Journal Lightning UI due to an oversized Apex heap size, as well as through the AmendPxService.amendSync() API, which exceeds the Apex CPU time limit.