Thank you -yes I understand what you are saying, although even if you summarise by vendor, BC should still be applying the entries it has summarised otherwise when posting the journal, all of the invoices would remain open and need to be manually applied to payments - or at least that is what I thought it is supposed to do!
If it does apply the entries with summarise by vendor switched on, then surely the fact that the allocation exists in one payment journal, should stop an invoice from appearing in another payment journal?
It seems surprising to me that I couldn't find any information online that suggests other people have experienced the same issue.
