Problem with importing IBIS model into ADS

Hi
I want to import an IBIS model of an ADC (AD9283AD9283BRS.rar) into ADS software. But when I use IBIS_IO from the Signal Integrity - IBIS Palette , I get the following error:

"No pins associated with the 'IBIS_IO' model type could be found for the component 'AD9283'. Please select a different component."

Which means that there is a problem with reading the pins. Amazing point is that, if I use IBIS_I or IBIS_O part, there would be no error and the pins would be read (of course just input or output pins with each part).

Can anyone help me with this problem?
Thanks

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