I have tried the same scenerio on my instance . I got the same error as you get when I change the Max length and on save BUT when I tried to save again(Clicked save button with the error on screen) I was able to save the property. I have verified that DB table column max length also changed.[Note: always test/try anything related to DB tables on some test data types or for existing data types have a backup]
withdrawn the rule in current RSV and create a property with same name in higher RSV.I am able to save the property rule without error now.
when i populate the field with more than 225 char, the error is displayed in the screen( which is expected behaviour)
when i populate the screen with more than 200 char and less than 225 -->Error is not shown in portal and Step page is populated with error message((HN-FW-RMCFW-Data-IDCard-TagTxtOvrd)StringTooLong "When we need to select from a large list of dynamically populated values then we give the control as When we need to select from a large list of dynamically populated values then we give the we give..." 200) due to which it is not saved in DB.