Produmex Scan - Problem with picking for a batch item

When we are trying to pick a batch managed item, once a batch is picked with partial quantity and we move back to the pick list lines screen, then another batch cannot be selected as the 1st batch number is showing on Rec. Batch field.

For example, if there is a pick list line with 20 qty and we have picked 10 qty from batch BN1 and posted, then picked 10 qty from batch BN2 and posted, then there is no issue.

But in the same scenario, if we pick 10 qty from batch BN1 and then move back to the pick list line screen. Again we select that particular line and try to pick the remaining 10 qty, it shows batch BN1 in Rec. Batch field and even on selecting batch BN2 for remaining 10 qty, it is not picked.

Above scenario is for pick list with no warehouse/bin or batch number selected while creating a pick list from sales order.