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You can use a simple hide when. &nbsp;In that case, you must have your controlling field be a checkbox or radio button with &quot;refresh on change&quot; turned on.<br />
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Another way is via the Entering event or the similar onFocus event. You can put in code there to check the controlling field, and if it is not set, then remove focus from the field. &nbsp;The user can try to enter it but will never succeed.
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You can use a simple hide when.  In that case, you must have your controlling field be a checkbox or radio button with "refresh on change" turned on.

Another way is via the Entering event or the similar onFocus event. You can put in code there to check the controlling field, and if it is not set, then remove focus from the field.  The user can try to enter it but will never succeed.

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I don't know why that did not occur to me, started thinking specifically of the validation area and not of just using a good old hide/when. 
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I don't know why that did not occur to me, started thinking specifically of the validation area and not of just using a good old hide/when.

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Have a field which asks the user if they are a registered representative. Have another field which asks for their agent_ID, I know how to force the input if the response to the initial registered representative question is yes, but how do I block the input of the field if the response is No. &nbsp;Can entry to a field be prohibited with explanation as to why they are not allowed to enter a value. 
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Have a field which asks the user if they are a registered representative. Have another field which asks for their agent_ID, I know how to force the input if the response to the initial registered representative question is yes, but how do I block the input of the field if the response is No.  Can entry to a field be prohibited with explanation as to why they are not allowed to enter a value. 

Blocking data entry

Lotus Software produced the Lotus 1-2-3 spreadsheet program, and later developed Lotus Notes, a groupware and email system. Following its acquisition by IBM, the Notes and Domino client/server collaborative platform were expanded to include functions such as email, calendars, to-do lists, contacts management, teamrooms, discussion forums, file sharing, microblogging, instant messaging, blogs, and user directories. IBM also release SmartSuite, a comprehensive office suite, and followed that with Symphony, unrelated to the Lotus suite of the same name.