Thanks for quick response.
I did QuickSearch but they want more 
. It’s strange that columns from SugPoDtl are not available.
To be able to add QuickSearch I created temporary customization with textbox bounded to SugNum and then add QuickSearch.
After that it is visible in New Po Suggestions “Binoculars” search but only if the QuickSearch is set to Base Default.
Note it will not even appear down here if you won’t select Base Default.
A little off topic but maybe someone will find it helpful some day.