[TYPO3-Solr] How to combine solr title field from multiple values?

[Jochen Weiland]

Hi,

I want the title field show the combination of two data columns 
(last_name, first_name):

		fields {

			title = COA
			title {
				10 = TEXT
				10 {
					field = last_name
					noTrimWrap = ||, |
				}
				20 = TEXT
				20 {
					field = first_name
					noTrimWrap = || |
				}
			}
		}	

For some (probably simple) reason that does not work.

Any ideas?

Best regards
Jochen