This is easiest to explain with an example…
A purchase is made costing £35,000. It is settled with 2 payments of £15K & £25K.
In the bank screen, it is possible to select the 2 payments out and create a single purchase transaction for the £35K…all OK to here
BUT …when you go into the receipt hub, QF can’t match the £35K invoice to a £35K payment, but it can be linked to the £15K or £25K payment.
It looks like Receipt hub is searching through the bank payments looking for a match instead of taking account that some invoices may have been settled with multiple payments.