Error message in OIM UI

Hi,

I have a field called agency which is mandatory. However we have created in the database as agency1(display name is agency) since agency was already created and written code based on agency1.  So when ever this field is not provided it is giving error message agency1 is mandatory however we need to display the error as agency is mandatory instead of agency1. Basically which means i need to remove 1 from the agency and display as agency rather than agency1...Could some one help me on this as this is very urgent.