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Go to Setup → Customer → Customer Management
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Search the desired Customer → click on Virtual series icon on the right side menu:
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Clicking on Virtual series opens up a new pop-up window as (which shows all the active allotment that exists for the customer (with the following details-Service Type, Start/End ref no. of the series, the Next available no. of the Series, Date Of Issue, Item Code, Series Type):
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User with permission can also delete the inventory from this page (either bulk/single):
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