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Why can't I  use USSD short code *300?

Update:11-30Source: network consolidation
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I am trying to access a service that runs on a USSD gateway with short code *300# but I am getting error "error performing request, Unknown error". Why is this so?

The Best Answer

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In an inline renderer, the compiler knows which document will be the “outerDocument” so it sets up special code to assign that value.  I think you can use parentDocument or owner.document