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

Update:11-30Source: network consolidation
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

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