3548630 - Flexible workflow for items in Purchase Requisition does not work for custom account assignment

Flexible Workflow for Purchase Requisitions has been activated. The role 'Accounting Object Responsible' has been maintained in Manage Workflows app, but it is not clear how the agent is determined in this case. 

SAP S/4HANA Cloud Public Edition

For each account assignment category, a different accounting object is used to determine the approver: 

• 'K' (Cost center): Cost Center object is used (if company code is assigned, it is also considered). Responsible user is taken from table CSKS.
• 'F' (Order): Internal Order object is used. Responsible user is taken from table AUFK.
• 'P' (Project): WBS Element object is used. Responsible user is taken from table PRPS.
• 'A' (Asset): Profit Center object is used. Responsible user is taken from table CEPC.
• For all other account assignment categories, the manager of the user is determined. 

custom account assignment , workflow , agent determination  , KBA , MM-FIO-PUR-REL-2CL , Fiori UI for Purchasing Approval (Public Cloud) , Problem