One fool-proof way would be to to write an SQL query via SQ00, where you can check the TOR_ITEM table, with item category = PRD, and the base business document contains the sales order number. You can then in ALV grid display just do a unique count of the column.
Other way, not foolproof, would be to use the TORROT label field. usually this field will contain the sales order/delivery number if there is only unique sales order/delivery/trq.
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