concurrent program compeleted with 'warning' status randomly

Hi,

When I excute below concurrent programs,they compeleted with 'warning' status randomly.

example:

1. I excuted Create Accounting concurrent programs.

2. The Create Accounting concurrent program is compeleted with 'warning' status.

3. I excuted Create Accounting concurrent programs again.

4. The Create Accounting concurrent program is compeleted with 'normal' status.

The  concurrent programs job is compeleted successfully, although the status is 'warning' .

Periods - Close Period
Accounting Program
Create Accounting
Synchronize WF LOCAL tables
Web ADI - Journal Import (Journal Import)
Synchronize WF LOCAL tables
CBO_CE Bank Statement Interface Upload

Do you have any suggestion or solution?