Hi Vimal
Step 1: Pick the value/price from ERP and Update in EWM.
Step 2: Before picking WT of high value (price) items are getting confirmed check the value and if its more than send email and then confirm WT.
Find out action for WT and write a condition to check value before confirm and send email.
Work flow is same as ECC.
Below fig will help to understand ur req and where to trigger what.
Note >> check This document will give good idea of PPF https://websmp109.sap-ag.de/~sapidb/011000358700000309842013E.PDF
Regards
Suraj