I believe this BAPI simulates the full creation of a sales order, so also checks internal consistency of data, pricing etc. So it does more than you require however it should also work for your purpose. The message seems to indicate that an internal rather than external number range is in use for the sales order type you are trying to simulate. Are you filling the parameter ORDER_HEADER_IN-DOC_NUMBER? If you leave it blank I think that should clear this error message
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