You have create an interaction with Interaction Type (SHOP_CART_ABANDONED) and Interaction Reason (POSSIBLY_ABANDONED) after in a while the interaction reason got updated to empty for the respective Interactions.
SAP Marketing Cloud Edition
SAP Marketing On-Premise from Release 1709 SP01
Interaction Reason, possibly abandoned , KBA , CEC-MKT-DM-IA , Interaction , How To
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