Binding invoices to payment fails

[vohmar]

Its not possible to bind payments to invoices in admin portal. No error is returned other than message "no invoices were binded"

Something has chagned in the process with the laste updates. Here is the log output of the binding process:

https://gist.github.com/ratM1n/9e9aa29e4229549e148fd560bba43b41

upper part is the new process, lower one is the process from when binding was working - everything starting from "Account Load" is missing in new one.

Is also looks like automatic bindings fail as well

[vohmar]

probably related to this PR #1450 (issue: #1415)

[vohmar]

invoices that in sum match invoices that have been canceled before also fail - need to add another condition - unpaid and not canceled

[vohmar]

fixed by #1499