MaxLength="10" Character Count Limit in a Data Field

Hello,
Below is the syntax I'm using trying to get a data field ( MyField ) in my panel to have a maximum allowance of 10 characters.
This syntax is not doing anything to limit the count. Do you know what I have wrong in the line below?
<xmp_property name="MyField" category="external" label="$$$/Custom/Property/MyField Input_Label= My Field:" type="text" maxLength="10" ui:width="50%" ui:mru="true"/>

Hi Jacob,
here a short example with char and string.
DATA: ST TYPE STRING.
DATA: CH(250).
START-OF-SELECTION.
  ST = 'I am a String with an % Character'.
  SEARCH ST FOR '%'.
  WRITE: / SY-SUBRC, sy-fdpos.
  CH = 'I am a Char with an % Character'.
  SEARCH CH FOR '%'.
  WRITE: / SY-SUBRC, sy-fdpos.
Regards, Dieter

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