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Ok small problem, I have a subform with the field ChildID, and i need some code so that it is not possible to select the same value for ChildID more than once in the form. I have attached a image of what i am talking about, the highlighted fields show what i want the end user to not be able to...

ok i got this calcualtion in my report =[NumberofscriptsMarked]*[paymentformarking] and i want to add £95 to it but £95 is not a field in my tables so how can i add £95 to that calcualtion in my report thanks