Letter of Invitation
If I remember correctly the Invitation is done by the tour company that arrange the visa for you. When I applied at the embassy in Dubai in 2011 they gave me a list of 3-4 operators that would do this.
All worked well at that time.
PS. There is another thread re guides. This question was never raised in 2011 and I would 'guess only' that it can be overcome in detaied discussion with travel agent whilst applying for the visa.
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