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Tech Tip: Understanding the message "That value is not allowed"
PRODUCT: 4D | VERSION: 2004 | PLATFORM: Mac & Win
Published On: February 27, 2008
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When entering data into a field, the following dialog may be displayed:



This is automatically displayed by 4D because the property "Required List" is set to a list, thus only data from that list can be entered. Here is a screen shot of the "Require List" property: