create FUNCTION [dbo].[uf_Get_TRANS_PLASMA]()
RETURNS NVARCHAR(4000)
AS
BEGIN
    declare @parameter_value nvarchar(100)
    select @parameter_value = parameter_value from xk_parameter where parameter_code = 'TRANS_PLASMA'
    if(@parameter_value = null or @parameter_value = '') 
    begin
		return '200'
    END
    else
    begin
		return @parameter_value
    end
    return '200'
END
GO