namespace issue in b1if

Hi all,

i am using namespace but i got following message when i am going to save. I am using patch level  SAP B1 9.1 and Patch Level 9

but same namespace working in SAP B1 9.1 and Patch Level 6. that time i am using same namespace multiple packages.  any one know this issue. really i am stuck in last one week.

Thanks & Regards

B.Lakshmi narayanan