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To get a complete error description, use the API function LMX_GetErrorMessage().
See LMX_Checkout for additional information about return values, which also apply to this function.
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The reservation token is a unique string you specify, and can have a length up to LMX_MAX_SHORT_STRING_LENGTH. The token is used to acquire the reservation, which later can be consumed (checked out) using the same token.
See LMX_Checkout for additional remarks, which also apply to this function.