Create Inventory Reservation without Existing Demand Document
You can use the Manage Reservations and Picks task to create inventory reservations when you don't have an existing demand, such as a sales order or transfer order, to reserve inventory against. In these cases, you can create a user-defined, account, or account alias demand.
In our example, let's create an inventory reservation against a user-defined demand document type.
Here's a summary of our overall steps:
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            Create the user-defined demand document type 
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            Confirm inventory reservation creation was successful 
Create the User-Defined Demand Document Type
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               From the Inventory Management work area, click the Tasks panel tab and select the Manage Reservations and Picks task. 
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               Click the Create Reservations button. 
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               In the Search Results: Demand region, click the Create list and then, select Create User-Defined Demand from the list. 
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               In the Create User-Defined Demand dialog box, enter or select these values: Fields Values Inventory Organization M1 Supply Document Type On hand Demand Document Name Demand Document 01 Item ABC01-100 Subinventory KKCONSUB Reserved Quantity 1 
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               Click OK to return to the Create Reservations page. 
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               Click Save and Close. 
Confirm Inventory Reservation Creation was Successful
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               On the Manage Reservations and Picks page, in the Advanced search region, enter or select these values: Fields Values Search Reservations Inventory Organization M1 Item ABC01-100 Demand Document Type User Defined 
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               Click Search. 
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               Click the Expand icon next to Organization M1 to see the item node. 
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               Click the Expand icon next to ABC01-100 to see the user-defined node. 
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               Click the Expand icon next to the User-Defined node to see your demand document. 
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               Click Done.