Hi, i dont seem to be able to issue a refund against any invoice that has more than one different item / nominal code on it, does anybody know why or if there is a way round this? majority of our invoices are for a number of different items and im struggling to know what to do with refunds and bank tagging because of it?
Hope somebody can help 
if you locate the original invoice and first initiate a credit note:
The new credit note screen will automatically load with all the original items reversed.
I thought that the OP meant that the problem was with partial refunds but I tried to replicate the problem without success.
I created a test invoice with lines against different nominal codes. I could refund in full or part from a particular line and could make a generic refund without explicitly specifying a nominal code. I didn’t check how QF applied a partial refund against the underlying nominal codes but from the way CNs appeared once I had made one partial refund there may be issues there which I didn’t investigate.