Direct function module to convert YEARWEEK to YEARMONTH

Hi Experts ,

I have been googling to finad a direct function module to convert given yearweek (201104) to yearmonth(201101) . But i couldn't find anywhere i hope some body can surely help me regarding this .

currently i am using VELO03_WEEK_OR_MONTH_TO_DATE to get the date from the given year,week and then calculating the month. but There is a risk that i may not get the correct YEARMONTH from this.

Please give me the solution for this problem . the best solution will be greeted with the best.

thanks in advance .