Even in simpler days 1980's when the CFO brought an off the peg Accounts receivable system, that caused problems with the billing system I worked on.

Eventually the system started writing broken BACS tapes and I had to fix the 6-7 months backlog of direct debits.

Neither the Company Secretary or I got even a thank you for fixing the problems.

Ok I did put Jack Scofield's (prominent uk tech journalists) bank account into the red :-)