we ll i am posting the same bolg again so it will be more short this time
the problem is if you use generated items from SQL adapter for a stored procedure with Char data type as parameter or you use an update gram with char data type of SQL server you will be unable to validate the generated schema. i observed this thing couple of months back so thought to share it with other.
the resolution is to change either the data type of the table field if your table filed is not critical or change the type of Stored procedure parameter. alternatively you can change the data type of schema from Char to xs:string
hope everybody will be able to understand it