So I have a situation as follows. We have many clients who are all invoiced on the 1st of each month on a recurring invoice for 1 of 10 plans.

This means that almost all payment dates are the same (some people pay late) and that a lot of the amounts are the same.

All payments are offline

This means that ZERO % of the time the Match works as it only seems to check date and amount.

All my customers pay using a reference number displayed on their invoice.

I wanted to create a "Transaction Rule" that matches a "Customer Payment", but that option is not available?

This means, the only way to Categorise a payment is to do it manually and search that reference number, find the customer and search for it again under "Categorise Manually". It is extremly time consuming & error prone. 

Is there any other solution?