Intercompany invoice not picking up IC transactions, as raw cost is zero

Summary:

I have created intercompany non-labour transactions. After running the Identify cross charge transactions processes, those transactions are marked as intercompany transactions. When I run the generate intercompany invoice, the transactions are not picked up. The exception reason says the transaction isn't billed because billing is based on raw or burdened cost that's zero. But the raw cost is not zero, we are not using burdening. The expenditure types rae in the relevant (bill) rate schedule. The intercompany balancing rules between the 2 legal entities are defined. So I am in the dark why those transactions are not picked up.