2841783 - How to define new Pre-condition in Manage Workflow for Purchase orders

You want to use the new Custom Pre-Condition:  New BADI available in 1902 S4HC.

You can define  new pre-conditions in Manage workflow app.You can use the Custom Fields and Logic app to create a BAdI implementation and publish the custom logic.

@is_sap_object_node_type-sont_key_part_1 , KBA , MM-FIO-PUR-PO-WFL , Purchase Order Workflow , MM-FIO-PUR-PO , Fiori UI for Purchase Orders , Problem