In our environment we need to import sales order and invoices from two files. But we need to relate them. We are not able to relate as ORIGNUMB and MSTRNUM are not visible in IM mapping. Though we have tried post script while importing invoice to populate ORIGNUMB(with order #) or MSTRNUM(the link between the two). It is treating both invoice and order as Different transactions and therefore reducing the Quantity Available twice. once at importing sales order and second time while importing invoice.
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