Error Message = 3120: Activity 'APEXP/219758' has no performer.

Hi Team,

I am encountering an issue with an expense report :

1. In the workflow notifications table, I can see as no performer. But I see the Manager is assigned and he has the signing limits to approve.

2. In the ap_expense_report_lines_all table I can see an validation error. In the column 'AP_VALIDATION_ERROR' the value I can see is 'This Combination is disabled. Please choose another'.

3. As per the above error, I checked the  Default GL code combination (Human Resources window) is active.

I searched few metalink notes ( no performer), but before following those. Just want to be clear on the above error. I appreciate, if some one can throw light on the above error.