Setting Default Source Inventory for non planned Internal Requisitions

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Is it applicable to set up a default inventory selection process where a specific inventory is automatically assigned when the source type is marked as "inventory in internal requestion screen. before the transfer order is created" Additionally, since I have two requestion business units, I want this default inventory assignment to be unique for each business unit's requisitions.

To clarify, I would like the system to automatically choose a specific predefined inventory whenever I select the source type as "inventory" for an internal requisition. Essentially, I want the default source inventory to be consistently set to the inventory I specify, so that every internal requisition submitted will have this predefined inventory as its source.