Hi Peter,
Thanks for the advice; there are no known issues that I can see where voiding bank transactions are dropping there AA codes. However I tested voiding an increase transaction in bank rec and when I ran an AA distribution query there were no AA codes picked up, so this is looking like a possible code issue.
Are you able to either log this as a support incident with MS or have your partner raise this with them so this can be looked into further. I suspect that this will likely end up being a bug in AA; if so this will be a no charge incident.
Regards
Rob