If you've created production or media costs in the budget but they aren't visible in the project detail, check if the Price column (representing the client-facing price) is filled in with an amount.
Price is the amount charged to the client.
Buy Price is the internal cost for the agency, which is not visible to the client.
If the Price (for the client) is set to zero, the expense item won't appear in the project detail. To display a zero-valued expense item in the project overview, we recommend using 0.0001 instead of zero.