You want to add more preconditions to the Workflow settings for Purchase Requisition.
S/4 Hana Cloud 1808
Reproducing the Issue
You have activated Flexible Workflow Settings for Purchase Requistions.
You access to the App Manage Workflow Settings for Purchase Requisitions.
It is not possible currently to add new pre-conditions in addition to those delivered by SAP.
However, approver agent determination based on different purchase requisition attributes can be influenced via Recipients -> Role ->"Agent Determination by BADI" for each step.
You can modify the recipients using the BAdI for agent determination based on implementation of BAdI MMPUR_WORKFLOW_AGENTS_V2(Workflow Agent determination).
Please refer to KBA note 2646400 for more details about BADI Implementation.
flexible WORKFLOW, MMPUR_WORKFLOW_AGENTS_V2 , KBA , MM-PUR-REQ , Purchase Requisitions , MM-FIO-PUR-REL , Fiori UI for Purchasing Approval , Problem