Adding Non-Serialized Inventory

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Hi all,

I have a requirement for adding 'Required Inventories' to activities in bulk using APIs. The problem I am facing is that, using APIs while I try to update the Required Inventories in bulk, its asking for the Model Number. In this scenario, the Inventory which I am trying to add has no such properties. Is there a way to add Inventory to activities without a Model Number? The API says the Model number is mandatory when we try to update the Inventory in Bulk. Interestingly, when we do individual update for activities to add the Required Inventory, the update is done