[otrs] working time stats

hi. i want to make a stat which tells me how much working time has passed between the creation of a ticket and the solution. Making a ticketlist stat i used create and close time to restrict the results and i tryed with the SolutionTimeWorkingTime at x axis but when i start the stat it return me 0 value. however i also used the accounted time but it works, so i dont know what i'm doing wrong. Ponencia en Congreso Internacional del Transporte. This electronic message contains information which may be privileged or confidential. The information is intended to be for the use of the individual(s) or entity named above.