Why lot numbers are getting removed during partial pick confirm of a sales order?

Summary:

We have a requirement where user can perform pick confirm for partial quantity. This is throwing a message saying reducing the quantity will remove the lot and serial number. This in turn removes the lot information. User needs to go to record lot number screen and enter the lot information. But we have setup picking rule with Lot FEFO as priority 1 . Hence why during partial pick confirm based on quantity it is not defaulting lot numbers? Are we missing some setup?

Thanks,

Saswati.

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