VALID User for object modification

Dear All,

Following error message is appeared at the time of modifying the object which I've just created in the NAV 2013 R2 (Build 35473) Database.

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Microsoft Dynamics NAV Development Environment

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To validate table changes for potential data-loss the current user must be a valid user on the system.



Check that:

1. The current user is a NAV user in the database, or

2. Microsoft Dynamics NAV Development Environment is running as Administrator, or

3. The current user is Administrator and UAC is turned off.

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OK

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Why does the system allow to create the object if it's not a VALID User ?