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Below Field Validation should work for Status Field
Field Validation for Status Field:
( [<SalesStage>]<>'A' AND (IfNull([<Status>],'Invalid')=IfNull(PRE('<Status>'),'Invalid'))) OR [<SalesStage>]='A'
As it is not possible to write Field Validation for Sales Stage, what you can do it to create a custom field and populate it with current Sales stage value. It can be done through workflow. Trigger Event of the workflow should be "Before Modified Record is Saved" and workflow condition [<Status>] IS NOT NULL
You can then write field validation on the Custom Field like below.
Field Validation for Custom Sales Stage Field
[<Status>] IS NOT NULL AND [<stCustom_Sales_Stage_ITAG>]=PRE( '<stCustom_Sales_Stage_ITAG>')
Hope this helps