create personnel subareas

Hi experts,

I just enrolled the course SAP HR module and hope you won't think my questions too stupid.

I tried to create my personnel subareas from SPRO's enterprise structure. This was what I wanted to do:

Personnel area: 0000

Personnel subarea: 01, 02, 03, 04, 05, 06 (all under personnel area 0000)

However, I kept getting an error message: "01 doesn't not exist in (check entry)" when I tried to create personnel subarea 01.

Do you know what was the problem and how should I fix it? Thanks in advance.

Catherine Sum

P.S. Sorry I just finished my third SAP HR class, please give me step by step instructions if possible.