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.
SAP S/4HANA 1909
KBA , MM-FIO-PUR-PO-WFL , Purchase Order Workflow , MM-FIO-PUR-PO , Fiori UI for Purchase Orders , Problem
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