You want to use the new Custom Pre-Condition: New BADI available in 1902 S4HC, see the link to find this information.
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.
KBA , MM-FIO-PUR-REL , Fiori UI for Purchasing Approval , MM-PUR-REQ , Purchase Requisitions , How To
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