Jan 21 (Reuters) - PTB Group Ltd PTB.AX :
* Profit guidance PTB.AX
* Says upgraded its forecast results for the December 2015 half year
* Says increase in the forecast is driven by higher than forecast results in the iap business for December
* Forecast for full year operating profit before tax, excluding foreign exchange gains and losses, remains unchanged at this point
* Says result mainly due to the finalisation of an engine deal that had not been included in the previous forecast
* Group-operating profit before tax (excluding foreign exchange gains and losses) to rise from $1.041 m to $2.900M for hy2015
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