Why isn't the min-max report creating any requisitions?
Min-max planning should create requisitions for min-max planned items that have their source type set as Supplier.
Ensure that you have set the item sourcing details type to Supplier:
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            In the Setup and Maintenance work area, go to the Manage Inventory Organization task. - 
                  Offering: Manufacturing and Supply Chain Materials Management 
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                  Functional Area: Facilities 
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                  Task: Manage Inventory Organization 
 
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            Search for the organization for which min-max requisitions aren't creating correctly. 
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            Click the Manage Inventory Organization Parameters button. 
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            Click the Item Sourcing Details tab. 
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            Under the Item Sourcing Details section, select Supplier in the Type field. 
Verify that requisitions are now being created:
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            Create a min-max item. 
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            Run the Min-Max Planning report. 
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            Submit the Process Supply Chain Orchestration Interface scheduled process.