Error when running AFAB

Hi experts,

I implemented AM in a company code. But when i run AFAB, the error message is below:

In area 01, acc. allocation is missing for account group 1050000

Message no. AA 719

Diagnosis

Inconsistent account assignment rules for depreciation posting have been determined.

System Response

You cannot post depreciation.

Procedure

Check and correct the account assignment.

But i have setted the G/L account for 1050000.

Who konw why that is??? And the system i'm using is 46C