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How do you show error message only once with a validator?

I created a regular expression validator on RTC but I'm receiving a duplicated error message. I only want the error message to show once. Do you know how to make the error message only show once?
RTC duplicates the error message, "Invalid value of attribute 'PTF'. The PTD # must start with "U", followed by a letter and five numbers. E.g. UI67891"
Thank you,
Jasmine
RTC duplicates the error message, "Invalid value of attribute 'PTF'. The PTD # must start with "U", followed by a letter and five numbers. E.g. UI67891"
Thank you,
Jasmine