Suppliers for Inter-Project Billing with a single LE

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Are there limitations for the use of Suppliers within a single Legal Entity for Inter-Project Billing? In the "Manage Intercompany Customer and Supplier Assignments" screen, we seem to be able to associate multiple customers with multiple suppliers within a single LE for (non-project) Inter-company transactions (by setting up under multiple Inter-company Orgs). However, for Inter-project billing, the invoicing (Acceptance in AR process) only seems to work when we use "All" as the Intercompany Organization.

Thanks,

Brian

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