Unless im missing something I have a small loophole in my setup.
I need to only allow a whole ticket to be charged to a particular payment type (predictably this is my PMS setup 
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I have to do this else it will throw my reporting/integration figures out as since I need to report department (wet dry etc) sales value only once and based on it not already being reported (via individual ticket room post).
At first though payment processor limit of max and min to {TICKET TOTAL} would work
HOWEVER there is a loophole in this;
£20 ticket total, £10 tendered and paid Cash then manual tendering £20 to Room Post.
This allows as the tendered amount is ticket total.
Admitibly this is a slim/narrow loophole but one I cant afford to leave open… 
I might have missed a trick and if so please let me know but if not @emre is there any chance of a solution?
