Alerts when entering data
If you receive one of these error messages, check the possibilities listed.
This field is not modifiable
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Prohibit modification of value could be selected for auto-entered data in Options for Define Fields.
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You might not have the correct access privileges. See your database administrator.
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Your password does not enable you to do this, or the file is not modifiable
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If you're sure your password allows this action, the field might be a related field from a file in which your access privileges don't allow you to edit records.
This field cannot be modified until <fieldname> is given a valid value
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You're trying to enter data into a related field, but the match field does not yet have a value. Enter a value in the match field, then enter data in the related field.
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The relationship is not valid and must be corrected before this field can be modified
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Related topics 
Can't click or tab into a field