Custom Reporting Assistance

Hi,

I am trying to create a custom report to check how much income I am getting per month. This is for a booking system.

My Current Report I have created is this:

All this is correct. However for Booking.com bookings, I also want to show the Commission amount which isnt on the sales invoice but will be on the purchase invoice for that month. How do I go about adding the value from the purchase invoices and filtered only for supplier == booking.com to get my total revenue for the month?

Reason I have a custom field is because I want to know the actual revenue per month of bookings as some bookings can be made for a different month so the profit and loss account does not show the true revenue per month.

Thanks in advance

Output of the existing Report is:

Names removed for confidentiality purposes

There is now new implementation of custom reports. See:

So have a look at that. In your case, you probably want to create custom report directly under Sales Invoices tab. Much easier to work with.