SharePoint does not search custom column

There was a small issue with SharePoint 2010 that in advanced search could not find documents with specific string in custom column.  We have a custom column Prof

../_layouts/OSSSearchResults.aspx?k=(scope:"Documents")  Prof=QA

In the list we can see that this field has that value and we can even filter on it.

So somthing is wrong with search?

Indeed if we search as ../_layouts/OSSSearchResults.aspx?k=(scope:"Documents")  owsProf=QA

it finds ok the item. S the problem is ac tually in managed property. It is either does not exisit or not mapped correctly to crawled property. To fix that goto Central Admin, SEarch service administration - Metadata Property Mappings and add missing property - Prof - then map to crawled property  ows_Prof(text)