No cross-system company code is defined for company code

Hi,

While practicing in IDES I have created company code and posting entry in fb50 I am getting error "No cross-system company code is defined for company code" when I create cross company code and assigned it then I am able to post the entry. But as soon as I post the entry system is automatically clearing the entry.

Even I post the even vendor invoice it is automatically cleared and no open item is appearing.

Kindly give solution.

Thanks,

Kiran