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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The field could be a calculation field or summary field.
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You might not have the correct access privileges. See your database administrator.
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The file containing the field could be read-only, or you might not have write access to the volume the file resides on (for example, if it's on a CD). See your database administrator.
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If you have copied the field from a layout in a different file, you might need to specify which field it is in this database.
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 value in the match field is the wrong type for the field's data type (for example, text in a number field).
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The value in the match field is non-alphanumeric (for example: @). If you need to use these characters in match fields, set both match fields' language for indexing to Unicode. See Defining field indexing options for more information.
The relationship is not valid and must be corrected before this field can be modified
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The field is a related field that has been deleted from the related file.
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The match field in the related file:
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has been deleted
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is a calculation or summary field
Related topics 
Can't click or tab into a field
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