Hi ganesh ,
If we use release procedure With clasification:
With this procedure requisition can be released both at item-by-item and total,depends on the settings in document type.
With this procedure external purchasing documents are released at header level only.
If we use release procedure without clasification:
With this procedure requisition can only be released at item level.
In requisition two procedures are manually exclusive,that is to say ,you must decide in favor of one of them only.you can not use both.
Also You could refer this [LINK|http://www.allinterview.com/showanswers/14156.html]
Best Regards
Manthan.
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