Can I suggest that the date input methodology is made consistent across the application?
When inputting a date in a Form (Invoice or Purchase Order) the date is input using n tab n tab i.e. 1st April 2014 would be entered as 1 <tab> 4 <tab> whereas in Reports it is input using n / n / i.e. 1 / 4 /.
Either use one or the other across the whole application preferably the / methodology.
This is a small but frustrating issue when moving around the application and I don't imagine it would be difficult to correct.